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question_answer1)
The reason for a physical change to be named as such is that the:
A)
change occurs only in physical properties done
clear
B)
transfer of energy takes place done
clear
C)
is a reversible change done
clear
D)
All of the above done
clear
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question_answer2)
When ice is heated, it changes to water and water on further heating gets converted to steam. What happens when steam is condensed?
A)
A new substance is formed done
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B)
No new substance is formed done
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C)
Gaseous phase changes to liquid phase done
clear
D)
Both (b) and (c) are correct done
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question_answer3)
A change is a chemical change when it is accompanied by:
A)
energy change done
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B)
formation of new substances done
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C)
change in chemical properties done
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D)
All of the above done
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question_answer4)
Which of the following will be observed if an apple slice is left exposed to air?
A)
It under goes oxidation and become brown in colour done
clear
B)
Appearance of brown colour on the surface of apple slice is caused by a chemical reaction between air and enzymes done
clear
C)
Both the above are correct done
clear
D)
None of these done
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question_answer5)
The shipping industry has to bear huge financial loss because of rusting of ships. The rusting of ships occur because:
A)
the body of ship is always in contact with water. done
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B)
the air around the ship is humid. done
clear
C)
presence of salts in sea water speed up the process of rusting. done
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D)
All of the above done
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question_answer6)
Which is the best method to prevent rusting?
A)
Painting done
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B)
Greasing done
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C)
Galvanization done
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D)
Precipitation done
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question_answer7)
A change in which the original substance can be obtained back by change of conditions is called:
A)
reversible change done
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B)
physical change done
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C)
chemical change done
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D)
Both (a) and (b) done
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question_answer8)
When magnesium is burnt, heat and light are produced. The burning of magnesium is a:
A)
reversible change done
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B)
physical change done
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C)
chemical and exothermic change done
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D)
chemical and endothermic change done
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question_answer9)
Change of milk to curd is a:
A)
physical change done
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B)
chemical change done
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C)
Both physical and chemical change done
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D)
Neither physical nor chemical change done
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question_answer10)
Expansion on heating and contraction on cooling of metals is a:
A)
chemical change done
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B)
physical change done
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C)
irreversible change done
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D)
None of these done
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question_answer11)
Which of the following changes is accompanied by sound?
A)
Photosynthesis done
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B)
Spoilage of food done
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C)
Explosion of fire works done
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D)
None of these done
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question_answer12)
Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released. This is an example of:
A)
a chemical reaction done
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B)
a physical change done
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C)
Crystallization done
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D)
None of these done
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question_answer13)
Which of the following statements is correct?
A)
Evaporation is a chemical change done
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B)
Digestion of food is a chemical change done
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C)
Burning of paper is a physical change done
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D)
All of the above done
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question_answer14)
Which of the following statements is correct?
A)
When coal is burnt no new substance is produced done
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B)
Rust is not formed in the absence of air or oxygen done
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C)
The fizz that comes out when a soda bottle is opened is due to a chemical change. done
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D)
Respiration is a physical process done
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question_answer15)
Which of the following statements is correct?
A)
Cutting of wood into pieces is a chemical change. done
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B)
Conversion of manure from leaves is a physical change. done
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C)
Iron pipes coated with zinc do not rust easily. done
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D)
All of the above done
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question_answer16)
Which of the following statements is correct?
A)
Iron and rust are same substance. done
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B)
Rusting of iron is a chemical change. done
clear
C)
Removal of rust from surface of iron is chemical change. done
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D)
All of the above done
clear
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question_answer17)
The process used to prevent rusting of iron, in which a thin coat of zinc is provided over iron surface. This process is:
A)
galvanization done
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B)
electroplating done
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C)
painting in zinc done
clear
D)
None of these done
clear
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question_answer18)
Chemical change that is accompanied by evolution of heat energy is:
A)
physical chemical change done
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B)
exothermic chemical change done
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C)
endothermic chemical change done
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D)
None of these done
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question_answer19)
Characteristic of matter exhibited without a change in its identity is:
A)
physical property done
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B)
chemical property done
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C)
thermal property done
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D)
None of these done
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question_answer20)
In which one of the following situations chemical reaction does not occur?
A)
Common salt is exposed to air done
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B)
Coal is burnt in air done
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C)
Sodium is placed in water done
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D)
Iron is kept in moist air done
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question_answer21)
Glowing of an electric bulb is a ________ change.
A)
physical done
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B)
chemical done
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C)
Both physical and chemical done
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D)
None of these done
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question_answer22)
Why rusting of iron is a chemical change?
A)
Because it changes its colour done
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B)
Because it makes iron powdery done
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C)
Because a new substance is formed done
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D)
None of these done
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question_answer23)
Adding salt to water makes it salty. Which of the following statement is true regarding this change?
A)
It is a chemical change because a new substance is formed done
clear
B)
It is a physical change because the original substances can be recovered done
clear
C)
It is a chemical change because there is exchange of heat done
clear
D)
It is a physical change because there is a slight change in colour. done
clear
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question_answer24)
Pooja took a candle in a vessel and heated the vessel. Even though the candle did not bum, it changed its shape and state. What kind of change is this?
A)
Irreversible change done
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B)
Physical change done
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C)
Chemical change done
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D)
None of these done
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question_answer25)
An oxide of iron from the following is
A)
mud done
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B)
dust done
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C)
rust done
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D)
None of these done
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question_answer26)
Which of the processes below involves change in state?
A)
Evaporation done
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B)
Condensation done
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C)
Sublimation done
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D)
All of the above done
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question_answer27)
Which of the following is necessary for rusting of iron?
A)
Water done
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B)
Air done
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C)
Heat energy done
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D)
Both (a) and (b) done
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question_answer28)
Which of the following is a physical change?
A)
Burning of kerosene done
clear
B)
Lighting an electric bulb done
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C)
Heating sugar in a pan done
clear
D)
Heating sulphur with iron fillings to red-hot state. done
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question_answer29)
Complete the following analogy Electrolyzing: chemical change :: crystallization
A)
Thermal change done
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B)
Physical change done
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C)
Neutralization done
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D)
Fast change done
clear
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question_answer30)
Which of the following is not a mixture?
A)
Air done
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B)
Pure water done
clear
C)
Sea water done
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D)
Lemonade done
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question_answer31)
Change in size, shape and state of a substance is a:
A)
Chemical change done
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B)
Cyclic change done
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C)
Physical change done
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D)
None of these done
clear
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question_answer32)
Which one of the following substance is a mixture?
A)
Copper done
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B)
Salt done
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C)
Sugar done
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D)
Muddy water done
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question_answer33)
Which of the following is not a chemical change?
A)
Digestion of food done
clear
B)
Conversion of liquified petroleum gas into gas on opening the cylinder. done
clear
C)
Photosynthesis done
clear
D)
Production of biogas from animal waste done
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question_answer34)
Complete the following equation of rusting of iron. \[\text{Iron(Fe)+A+moisture}\to \text{B}\]
A)
A = Oxygen, B = Carbon dioxide done
clear
B)
A = Water, B = Oxygen done
clear
C)
A = Oxygen, B = Rust (iron oxide) done
clear
D)
A = Carbon dioxide, B = Oxygen done
clear
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question_answer35)
What is the formula of rust?
A)
\[\text{F}{{\text{e}}_{\text{3}}}{{\text{O}}_{\text{4}}}\] done
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B)
\[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\] done
clear
C)
\[\text{FeO}\] done
clear
D)
None of these done
clear
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question_answer36)
DIRECTIONS: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
(A) heat energy is evolved during the reaction | (p) Physical change |
(B) Heat energy is absorbed | (q) Chemical change |
(C) Digestion of food in the body | (r) Exothermic reaction |
(D) Melting of wax | (s) Endothermic reaction |
A)
(A) \[\to \] (p), (B) \[\to \] (q), (C) \[\to \] (r), (D) \[\to \] (s) done
clear
B)
(A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (r), (D) \[\to \] (s) done
clear
C)
(A) \[\to \] (r), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (q) done
clear
D)
(A) \[\to \] (r), (B) \[\to \] (s), (C) \[\to \] (q), (D) \[\to \] (p) done
clear
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question_answer37)
DIRECTIONS: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
(A) Pasteurization of milk | (p) Physical change |
(B) Explosion of fireworks | (q) Rusting of iron |
(C) A chemical equation | (r) Physical change |
(D) Formation of iron oxide | (s) \[Magnesium\text{ }\left( Mg \right)+Oxygen~({{O}_{2}})\to Magnesium\,oxide\,(MgO)\] |
A)
(A) \[\to \] (s), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (r) done
clear
B)
(A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (q) done
clear
C)
(A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (s) done
clear
D)
(A) \[\to \] (p), (B) \[\to \] (r), (C) \[\to \] (s), (D) \[\to \] (q) done
clear
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question_answer38)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 1 Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. Soon the colour of blue solution changes to green and a brown deposit appears on the iron nails. Change of colour from blue to green in the above activity represents:
A)
physical change done
clear
B)
chemical change done
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C)
Both of the above done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer39)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 1 Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. Soon the colour of blue solution changes to green and a brown deposit appears on the iron nails. Green colour of the solution is due to the formation of....................
A)
Copper sulphate done
clear
B)
Iron sulphate done
clear
C)
Copper metal done
clear
D)
none of these done
clear
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question_answer40)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 1 Take a small quantity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3-5 medium sized iron nails in it. Soon the colour of blue solution changes to green and a brown deposit appears on the iron nails. Brown deposits that appears on iron nails Is due to deposition of:
A)
iron on iron nails done
clear
B)
copper on iron nails done
clear
C)
copper sulphate on iron nails done
clear
D)
iron sulphate on iron nails done
clear
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question_answer41)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 2 Salt dissolved in water forms solution. Salt holding capacity of water is limited. When this limit is reached the solution is said to be saturated. Excess salt, if any, separates out from a saturated solution in the form of salt crystals. These crystals are more than 90% pure. We make use of the process of crystallization for obtaining salt from sea water. The crystals that are obtained after crystallization are:
A)
10%pure done
clear
B)
between 20% to 50% pure done
clear
C)
between 50% to 90% pure done
clear
D)
more than 90% pure done
clear
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question_answer42)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 2 Salt dissolved in water forms solution. Salt holding capacity of water is limited. When this limit is reached the solution is said to be saturated. Excess salt, if any, separates out from a saturated solution in the form of salt crystals. These crystals are more than 90% pure. We make use of the process of crystallization for obtaining salt from sea water The process of crystallization is used to obtain pure compound from an impure sample. Which of the following statements is correct?
A)
Process of crystallization is an example of a chemical change. done
clear
B)
Process of crystallization is an example of a physical change. done
clear
C)
Process of crystallization involves an irreversible change. done
clear
D)
All the above are correct. done
clear
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question_answer43)
DIRECTIONS: Read the passage given below and answer the questions that/allow. Passage - 2 Salt dissolved in water forms solution. Salt holding capacity of water is limited. When this limit is reached the solution is said to be saturated. Excess salt, if any, separates out from a saturated solution in the form of salt crystals. These crystals are more than 90% pure. We make use of the process of crystallization for obtaining salt from sea water A solution in which no more solute can be dissolved is called
A)
unsaturated solution done
clear
B)
saturated solution done
clear
C)
true solution done
clear
D)
None of these done
clear
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question_answer44)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Tearing of a paper sheet into small pieces is a chemical change. Reason (R): It is not possible to rejoin small pieces of paper to get back the original paper sheet.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer45)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Formation of rust is a chemical change. Reason (R): For formation of rust, iron must be exposed to air and water.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer46)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Burning of a candle is a physical change. Reason (R): The products formed by burning a candle cannot be easily converted back to original candle.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer47)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Some changes which result in formation of new substances are called chemical changes. Reason (R): Chemical changes are irreversible.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer48)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Burning of paper is a physical change. Reason (R): The products formed on burning of paper cannot be converted back to paper.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer49)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Coating an iron sheet with a layer of zinc is called galvanization. Reason (R): The process which converts iron to iron oxide in the presence of moisture and air is called rusting.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer50)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Decay and decomposition of dead organic matter (leaves and dead animal bodies) by microbes is a chemical reaction. Reason (R): In a chemical change original substance and its properties are changed to new material with new properties.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer51)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Explosion of a fire cracker is a physical change. Reason (R): A physical change is a reversible change.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
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question_answer52)
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Lime water turns milky due to presence of calcium bicarbonate. This is a confirmatory test of\[\text{C}{{\text{O}}_{\text{2}}}\]. (ii) Digestion of food and melting of wax are considered as similar type of changes.
A)
Statement (i) is correct while statement (ii) is incorrect. done
clear
B)
Statement (ii) is correct while statement (i) is incorrect. done
clear
C)
Both statements are correct done
clear
D)
Both statements are incorrect. done
clear
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question_answer53)
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Condensation of steam is not a chemical change (ii) Physical change is a permanent and irreversible change
A)
Statement (i) is correct while statement (ii) is incorrect. done
clear
B)
Statement (ii) is correct while statement (i) is incorrect. done
clear
C)
Both statements are correct done
clear
D)
Both statements are incorrect. done
clear
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question_answer54)
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Cutting of wood is considered as a chemical change (ii) Crystallization is a physical change
A)
Statement (i) is correct while statement (ii) is incorrect. done
clear
B)
Statement (ii) is correct while statement (i) is incorrect. done
clear
C)
Both statements are correct done
clear
D)
Both statements are incorrect. done
clear
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question_answer55)
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Which of the following changes represent a chemical change?
A)
Only (i) done
clear
B)
Only (ii) done
clear
C)
(i) and (ii) done
clear
D)
None of the two done
clear
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question_answer56)
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: What is the name of the process that is shown in the given figure?
A)
Evaporation done
clear
B)
Sublimation done
clear
C)
Neutralization done
clear
D)
Crystallization done
clear
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question_answer57)
Direction: Look at the following diagram carefully and answer the following questions:
Rusting of iron nail will be faster in which of following test tube.
A)
A done
clear
B)
Both A and B done
clear
C)
B done
clear
D)
Equal in A, B and C done
clear
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question_answer58)
Direction: Look at the following diagram carefully and answer the following questions:
On the basis of given figure read the following statements and choose the correct option. (i) Oil present in test tube A cut off the presence of air. (ii) \[\text{CaC}{{\text{l}}_{\text{2}}}\] is used for absorbing moisture in the test tube C. (iii) Rusting decreases on adding saline water in test tube B.
A)
I and III are correct done
clear
B)
I and II are correct done
clear
C)
Only III is correct done
clear
D)
All of the above done
clear
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question_answer59)
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Which of the following represents a physical change?
A)
(i) and (ii) done
clear
B)
(ii) and (iii) done
clear
C)
(i) and (iii) done
clear
D)
only (i) done
clear
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question_answer60)
Liquefied Petroleum Gas (L.P.G) used as kitchen fuel is supplied in the liquid form in the gas cylinders. When it comes out from cylinder it comes out as a gas which bums. Which of the following statements is correct?
A)
The process of conversion of liquid to gas involves a chemical change. done
clear
B)
The process of burning gas is a chemical change. done
clear
C)
Both the above are correct. done
clear
D)
None of these done
clear
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question_answer61)
Choose correct option on the basis of statement (i) and (ii) (i) When hydrogen bums in oxygen, water is formed (ii) When water is electrolyzed, hydrogen and oxygen are formed.
A)
(i) is a physical change and (ii) is a chemical change done
clear
B)
(i) is a chemical change and (ii) is a physical change done
clear
C)
Both (i) and (ii) are physical changes done
clear
D)
Both (i) and (ii) are chemical changes done
clear
View Solution play_arrow
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question_answer62)
Select the one that is not a chemical change:
A)
Dissolution of ammonia in water done
clear
B)
Dissolution of carbon dioxide in water done
clear
C)
Dissolution of oxygen in water done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer63)
...................... is a chemical change
A)
Mixing of paint colours done
clear
B)
Cleaning rust of a bridge done
clear
C)
Pressing fibres to make paper done
clear
D)
Baking a cake done
clear
View Solution play_arrow
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question_answer64)
On adding a few drops of dilute sulphuric acid to the blue vitriol (copper sulphate) solution, we get a blue coloured solution. When we drop a shaving blade into this blue coloured solution blue colour changes to green after sometime. Which type of change is illustrated by this activity?
A)
Physical change done
clear
B)
Chemical change done
clear
C)
Both of these done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer65)
Choose the correct option on the basis of two statements (i) and (ii) (i) Hydrogen gas reacts with oxygen gas to form liquid water. (ii) Liquid water on evaporation changes to water vapour.
A)
(i) is a chemical change, (ii) is a physical change done
clear
B)
(i) is a physical change, (ii) is a chemical change done
clear
C)
Both (i) and (ii) are physical changes done
clear
D)
Both (i) and (ii) are chemical changes done
clear
View Solution play_arrow
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question_answer66)
In neutralization reaction acid reacts with a base to form salt and water and a lot of heat energy is given out. This reaction is:
A)
an exothermic physical change done
clear
B)
an endothermic chemical change done
clear
C)
an exothermic chemical change done
clear
D)
an endothermic physical change done
clear
View Solution play_arrow
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question_answer67)
Surface of a reactive metal may be attacked by air, water or other substances causing corrosion. Corrosion of iron is called rusting. The product formed by rusting is:
A)
rust done
clear
B)
a brown solid done
clear
C)
Both of these done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer68)
Anaerobic bacteria digest animal waste and produce biogas (Changed A). The biogas is then burnt as fuel (Change B). The following statements are related to these changes. Choose the correct one.
A)
A is a chemical change whereas B is a physical change. done
clear
B)
5 is a chemical change whereas A is a physical change. done
clear
C)
Both A and 5 are physical changes. done
clear
D)
Both A and B are chemical changes. done
clear
View Solution play_arrow
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question_answer69)
A metal when left exposed to the atmosphere for some time gets coated with green basic carbonate. The metal in question is
A)
Copper done
clear
B)
Nickel done
clear
C)
Silver done
clear
D)
Zinc done
clear
View Solution play_arrow
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question_answer70)
Two changes are stated below: (i) A piece of magnesium gives of bright flames when burnt. (ii) A piece of iron glows red when heated strongly. Which of the above changes is a physical change?
A)
i only done
clear
B)
ii only done
clear
C)
Both i and ii done
clear
D)
neither i nor ii done
clear
View Solution play_arrow
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question_answer71)
Some pieces of chalk were taken and mixed with water. In this change, how many new substances are formed?
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
No new substances is formed done
clear
View Solution play_arrow
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question_answer72)
In a pressure-kerosene stove (i) We pump kerosene and convert it into vapours. (ii) The vapours are then ignited. Which of the following option is correct about the above statements?
A)
(i) is a chemical change; (ii) is a physical change. done
clear
B)
(i) is a physical change; (ii) is a chemical change. done
clear
C)
(i) and (ii) both are physical changes done
clear
D)
(i) and (ii) both are chemical changes done
clear
View Solution play_arrow
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question_answer73)
On the basis of reactions given below Acetic acid + Sodium hydrogen carbonate \[\to \](i) (i)\[\text{+Ca(OH}{{\text{)}}_{\text{2}}}\to \text{(ii)+water}\] (i) and (ii) will be?
A)
\[\text{(i)}\,\text{CaC}{{\text{O}}_{\text{3}}}\text{;}\,\text{(ii)}\,\text{C}{{\text{O}}_{\text{2}}}\] done
clear
B)
\[\text{(i) }{{\text{H}}_{\text{2}}}\text{O;}\,\text{(ii)}\,\text{CaC}{{\text{O}}_{\text{3}}}\] done
clear
C)
\[\text{(i) C}{{\text{O}}_{\text{2}}};\,(\text{ii})\,\text{CaC}{{\text{O}}_{\text{3}}}\] done
clear
D)
\[\text{(i)}\,{{\text{H}}_{\text{2}}}\text{O;}\,\,\text{(ii)}\,\text{C}{{\text{O}}_{\text{2}}}\] done
clear
View Solution play_arrow
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question_answer74)
Which of the following statement is correct?
A)
Burning of coal does not produce a new substance. done
clear
B)
Rust is hydrated \[\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{.}\] done
clear
C)
The fizz that comes out when a soda bottle is opened is due to a chemical change. done
clear
D)
Respiration is a physical process. done
clear
View Solution play_arrow
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question_answer75)
Which of the following statement is true about chemical equation?
A)
Mass is conserved done
clear
B)
Atoms are conserved done
clear
C)
Mass as well as atoms are conserved done
clear
D)
Molecules are conserved done
clear
View Solution play_arrow
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question_answer76)
Pollution of air is a
A)
chemical change done
clear
B)
physical change done
clear
C)
None of (a) or (b) done
clear
D)
Both (a) and (b) done
clear
View Solution play_arrow
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question_answer77)
Which of the following is the chemical name of blue vitriol (neela thotha)?
A)
Sulphuric acid done
clear
B)
Calcium carbonate done
clear
C)
Copper sulphate done
clear
D)
Zinc sulphate done
clear
View Solution play_arrow
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question_answer78)
We mm on a bulb and filament changes its colour and becomes bright. Is it chemical change like burning?
A)
No, filament bum itself but that is not chemical change done
clear
B)
Yes, filament bums itself like wood to give light done
clear
C)
No, filament does not change into something new done
clear
D)
Yes, filament made up of tungsten changes to its oxide on burning done
clear
View Solution play_arrow
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question_answer79)
Brown colour of the apple after cutting is a
A)
Chemical change done
clear
B)
biological change done
clear
C)
Physical change done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer80)
For protection of iron pipes from corrosion they are coated with
A)
Silver done
clear
B)
Copper done
clear
C)
Aluminum done
clear
D)
Zinc done
clear
View Solution play_arrow
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question_answer81)
Which of the following is the name of the process of obtaining salt by evaporation of sea water?
A)
Amalgamation done
clear
B)
Sublimation done
clear
C)
Crystallization done
clear
D)
Galvanization done
clear
View Solution play_arrow
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question_answer82)
Blacksmith grinds edges of iron axe against a spinning wheel to sharpen it. Sparks of fire and heat is generated. On the basis of this statement choose the correct answer.
A)
It is a physical change as only shape of axe changes. done
clear
B)
It is a chemical change as heat is generated. done
clear
C)
It is chemical change as iron turns into new metal. done
clear
D)
None of these. done
clear
View Solution play_arrow
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question_answer83)
Magnesium ribbon bums in candle flame with
A)
brilliant green light done
clear
B)
brilliant white light done
clear
C)
brilliant red light done
clear
D)
brilliant yellow light done
clear
View Solution play_arrow
-
question_answer84)
Read the given statements and choose the correct option. (I) Iron and sulphur are mixed to form a black and yellow mixture. (II) Mixture of iron and sulphur is heated to form a non-magnetic shiny grey substance.
A)
(I) is a chemical change done
clear
B)
(II) is a physical change done
clear
C)
Both are chemical changes done
clear
D)
(I) is a physical change and (K) is a chemical change done
clear
View Solution play_arrow
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question_answer85)
When carbon dioxide is passed through lime water, it turns milky due to two formation of
A)
Calcium hydroxide done
clear
B)
Sodium hydrogen carbonate done
clear
C)
Calcium carbonate done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer86)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
(A) Magnesium burnt in air | (p) Powdery ash is formed |
(B) Iron reacts with copper sulphate solution | (q) Color changes from blue to green |
(C) Coal is burnt in air | (r) \[\text{C}{{\text{O}}_{\text{2}}}\]is formed |
(D) Photosynthesis | (s) \[\text{C}{{\text{O}}_{\text{2}}}\]is used |
A)
(A) \[\to \] (p), (B) \[\to \] (q), (C) \[\to \] (r), (D) \[\to \] (s) done
clear
B)
(A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (r), (D) \[\to \] (s) done
clear
C)
(A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (r) done
clear
D)
(A) \[\to \] (p), (B) \[\to \] (q), (C) \[\to \] (s), (D) \[\to \] (r) done
clear
View Solution play_arrow
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question_answer87)
Directions: Match Column-I with Column-II and select the correct answer using the codes given below the columns.
Column - I | Column - II |
(A) The metal deposited on iron nails when they are dipped in the solution of copper sulphate. | (p) Rusting |
(B) The substance/crust which gets deposited on an iron pan when left in moist air. | (q) Copper |
(C) The process which converts iron to iron oxide in the presence of moisture and air. | (r) Galvanization |
(D) Coating an iron sheet with a layer of zinc. | (s) Rust |
A)
(A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) done
clear
B)
(A) \[\to \] (r), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (q) done
clear
C)
(A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (r) done
clear
D)
(A) \[\to \] (s), (B) \[\to \] (q), (C) \[\to \] (p), (D) \[\to \] (r) done
clear
View Solution play_arrow
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question_answer88)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. Which of the following occurs during a chemical change?
A)
Exchange of heat done
clear
B)
Change of smell done
clear
C)
Change of taste done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer89)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. When we add sugar to water, it becomes sweet. Which of the following statements is TRUE regarding this change?
A)
It is a chemical change because a new substance is formed done
clear
B)
It is a chemical change because there is exchange of heat. done
clear
C)
It is a physical change because the original substance can be recovered. done
clear
D)
It is a chemical change because there is only change in colour. done
clear
View Solution play_arrow
-
question_answer90)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. Which of the following statements is not correct?
A)
In a chemical change, colour of the object may change. done
clear
B)
In a chemical change, heat will always be released. done
clear
C)
A chemical change always involves physical change. done
clear
D)
Rusting of iron becomes faster when humidity is high. done
clear
View Solution play_arrow
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question_answer91)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. Which of the following is a chemical change?
A)
Foul smell comes when food gets spoiled done
clear
B)
Pollution of air due to explosion of fire-work. done
clear
C)
Change in colour of a cut apple if left outside. done
clear
D)
All of the above. done
clear
View Solution play_arrow
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question_answer92)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. The reason for a physical change to be named as such is that the
A)
change occurs only in physical properties done
clear
B)
transfer of energy occurs done
clear
C)
is a reversible change done
clear
D)
All the above are correct done
clear
View Solution play_arrow
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question_answer93)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A change in which two or more substances (reactants) combine to produce one or more new substances (products) that has/have different chemical properties than the reactants is called chemical change. In a chemical change new products are formed. The characteristics of a chemical change are following: 1. Heat, light or any other radiation (ultraviolet) may be given off or absorbed. 2. Sound may be produced. 3. A change in smell may take place or a new smell may be given off. 4. A colour change may take place. 5. A gas may be formed. Change in which only physical properties of any substances get changed and no new substance is formed is called a physical change. Such as shape, size, colour and state, is known as physical change. A physical change is mostly reversible and during physical change no new substances are formed. A change is considered as a chemical change when
A)
it is accompanied by energy change done
clear
B)
it is accompanied by formation of new substances done
clear
C)
it is accompanied by change in physical properties done
clear
D)
All the above are correct done
clear
View Solution play_arrow
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question_answer94)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Look at the following diagram and answer the given questions.
Which type of change is shown in the above diagram?
A)
Chemical change done
clear
B)
Physical change done
clear
C)
Reversible change done
clear
D)
Both (a) and (b) done
clear
View Solution play_arrow
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question_answer95)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Look at the following diagram and answer the given questions.
Above shown process will be faster in which area?
A)
Hilly area done
clear
B)
Desert area done
clear
C)
Coastal area done
clear
D)
Equally faster in all areas done
clear
View Solution play_arrow
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question_answer96)
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Look at the following diagram and answer the given questions.
Which of the following is the prevention method for the process shown in the given diagram?
A)
Painting iron door done
clear
B)
Coating of iron pipes with zinc metal done
clear
C)
Greasing of metal surface done
clear
D)
All of these done
clear
View Solution play_arrow
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question_answer97)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Change of water from liquid to steam on heating is a physical change. Reason (R): The volume during heating remains the same and the change involves a change in composition.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer98)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Evolution of gas is confirmed sign of physical change. Reason (R): Hydrogen gas is evolved on reaction of acids on metals.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer99)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Blue color of copper sulphate solution changes on addition of piece of zinc. Reason (R): Zinc is above copper in activity series
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer100)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Breaking of a bone china plate is a physical change. Reason (R): When a bone china plate breaks, the pieces cannot be joined to get back the original plate.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer101)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Respiration is an exothermic process. Reason (R): In an exothermic process heat is evolved.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer102)
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Conversion of oxygen to ozone is a chemical change. Reason (R): Ozone acts as a protective shield and protects us from harmful radiation of the sun.
A)
Both A and R are true and R is the correct explanation of A. done
clear
B)
Both A and R are true but R is not the correct explanation of A. done
clear
C)
A is true but R is false. done
clear
D)
A is false but R is true. done
clear
View Solution play_arrow
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question_answer103)
DIRECTIONS: Read the following three statements and choose the correct answer. (i) A few drops of petrol poured on to your palm will feel cool, because it involves evolution of heat. (ii) Burning of a petrol is an exothermic reaction. (iii) Neutralization reaction is an endothermic change.
A)
Statement (i) and (iii) are incorrect but (ii) is correct done
clear
B)
Statement (i) and (ii) are incorrect but (iii) is correct done
clear
C)
All statements are correct done
clear
D)
All statements are incorrect done
clear
View Solution play_arrow
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question_answer104)
DIRECTIONS: Read the following three statements and choose the correct answer. (i) Cooking of rice is a physical change. (ii) Pasteurization of milk is a chemical change (iii) Iron pipes coated with zinc do not get rusted easily
A)
Statement (i) and (iii) are incorrect but (ii) is correct done
clear
B)
Statement (i) and (ii) are incorrect but (iii) is correct done
clear
C)
All statements are correct done
clear
D)
All statements are incorrect done
clear
View Solution play_arrow
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question_answer105)
DIRECTIONS: Read the following three statements and choose the correct answer. (i) Burning of magnesium ribbon is an endothermic reaction. (ii) Magnesium on burning in air forms ash. (iii) Ash formed on burning of magnesium ribbon is magnesium dioxide.
A)
Statement (i) and (iii) are incorrect but (ii) is correct done
clear
B)
Statement (i) and (ii) are incorrect but (iii) is correct done
clear
C)
All statements are correct done
clear
D)
All statements are incorrect done
clear
View Solution play_arrow
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question_answer106)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In an experiment a painted iron nail was placed into a beaker containing sea water (Fig 'A'). The beaker was left undisturbed for about 10 days. After 10 days, the nail began to rust (Fig 'B') which of the following statements is/are correct?
(i) Poor quality paint was used to paint iron nail. (ii) Oxygen and water cause rusting. (iii) Presence of salts in sea water enables rust formation faster.
A)
(i) only done
clear
B)
(ii) only done
clear
C)
(iii) only done
clear
D)
(ii) and (iii) done
clear
View Solution play_arrow
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question_answer107)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: The four diagrams below represents the results of mixing atoms of different substances. Each atom is represented by a different symbol. Which diagram correctly shows a chemical change?
A)
B)
C)
D)
View Solution play_arrow
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question_answer108)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Three substances given below are kept in the open for a few days and some changes were observed.
Which of the substances will show chemical changes?
A)
Eggs done
clear
B)
Plastic bottle done
clear
C)
Both eggs & moth balls done
clear
D)
All eggs, plastic bottle and moth balls done
clear
View Solution play_arrow
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question_answer109)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Which of the following Venn diagrams shows the relationship between changes correctly?
A)
B)
C)
D)
View Solution play_arrow
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question_answer110)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: What causes the candle flame to get extinguished?
A)
Evolution of \[{{\text{O}}_{\text{2}}}\] gas done
clear
B)
Evolution of \[\text{C}{{\text{O}}_{\text{2}}}\] gas done
clear
C)
Formation of \[\text{Ca}{{\left( \text{OH} \right)}_{\text{2}}}\] done
clear
D)
Formation of \[\text{CaC}{{\text{l}}_{\text{2}}}\] done
clear
View Solution play_arrow
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question_answer111)
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Which portion of a ship shown below will rust the fastest?
A)
A done
clear
B)
B and C done
clear
C)
C done
clear
D)
A, B and C will get rust equally done
clear
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question_answer112)
The diagram below shows the formation of two water molecules
How many atoms combined to form the two water molecules?
A)
Total 6, two oxygen and four hydrogen atoms done
clear
B)
Total 6, two hydrogen and four oxygen atoms done
clear
C)
Total 6, three oxygen and three hydrogen atoms done
clear
D)
Total 10, six hydrogen and four oxygen Atoms done
clear
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