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You have been provided with three test tubes. One of them contains, distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tubes?
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Why should curd and sour substances not be kept in brass and copper vessels?
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Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example.
How will you test for the presence of this gas?
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Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
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Why do
etc. show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?
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Why does an aqueous solution of acid conduct electricity?
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Why does dry
gas not change the colour of the dry litmus paper?
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While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
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How is the concentration of hydronium ions
affected when a solution of an acid a diluted?
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How is the concentration of hydroxide ions
affected when excess base is dissolved in a solution of sodium hydroxide?
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You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration ? Which of this is acidic and which one is basic?
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What effect does the
concentration of
ions
have on the nature of the solution?
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Do basic solutions also have
ions ? If yes, then why are these basic ?
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What is the common name of the
compound
?
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Name the substance which on treatment with chlorine yields bleaching powder.
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Name the sodium compound which is used for softening hard water.
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What will happen if a solution of sodium hydrogen carbonate is heated ? Give the equation of the reaction involved.
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Write an equation to show the reaction between plaster of Paris and water.
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A solution turns red litmus blue, its pH is likely to be
(a) 1 (b) 4 (c) 5 (d) 10
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A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
(a)
(b)
(c)
(d)
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10 mL of a solution of NaOH is
found to be completely neutralised by 8 mL of a given solution of
If we
take 20 mL of the same solution of NaOH/ the amount of
solution
(the same solution as before) required to neutralize it will be
(a) 4 mL (b)
8mL (c) 12 mL (d)
16 mL
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Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic
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Write word equations and then balanced equations for the reaction taking place when:
(a) Dilute sulphuric add reacts with zinc granules
(b) Dilute hydrochloric add reacts with magnesium ribbon
(c) Dilute sulphuric acid reacts with aluminium powder
(d) Dilute hydrochloric acid reacts with iron fillings.
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Compounds such as alcohol and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.
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Why does distilled water not conduct electricity, whereas rain water does?
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Why do acids not show acidic behaviour in the absence of water ?
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Five solutions A, B, C, D and £ when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is :
(a) neutral ? (b) strongly alkaline? (c) strongly acidic? (d) weakly acidic?
(e) weakly alkaline?
(f) Arrange the pH in increasing order of hydrogen-ion concentration.
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Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (
) is added to test tube A, while acetic acid
is added to test tube B. In which test tube will the fizzing occur more vigorously and why?
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Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.
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A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline ?
(b) Why does this milk take a long time to set as curd?
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Plaster of Paris should be stored in a moisture proof container. Explain Why?
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What is neutralization reaction? Give two examples.
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Give two important uses of washing soda and baking soda.
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question_answer34)
What happens when a solution of an acid is
mixed with a solution of a base in a test tube?
(i) The
temperature of the solution increases.
(ii) The
temperature of the solution decreases.
(iii) The
temperature of the solution remains the same.
(iv) Salt
formation takes place.
(a)
Only (i) (b) (i) and (iii) (c)
(ii) and (iii) (d) (i) and (iv)
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question_answer35)
An aqueous solution turns red litmus
solution blue. Excess addition of which of the following solution would reverse
the change?
(a)
Baking powder (b)
Lime
(c)
Ammonium hydroxide solution (d) Hydrochloric acid
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question_answer36)
During the preparation of hydrogen
chloride gas on a humid day, the gas is usually passed through the guard tube
containing calcium chloride. The role of calcium chloride taken in the guard
tube is to
(a)
absorb the evolved gas (b) moisten the
gas
(c)
absorb moisture from the gas (d) absorb ions from
the evolved gas
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question_answer37)
Which of the following salts does not
contain water of crystallization?
(a)
Blue vitriol (b) Baking soda (c) Washing
soda (d) Gypsum
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question_answer38)
Sodium carbonate is a basic salt because
it is a salt of
(a)
strong acid and strong base (b) weak acid and
weak base
(c)
strong acid and weak base (d) weak acid and
strong base
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question_answer39)
Calcium phosphate is present in tooth
enamel. Its nature is
(a)
basic (b) acidic (c)
neutral (d) amphoteric
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question_answer40)
A sample of soil is mixed with water and
allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange.
Which of the following would change the colour of this pH paper to
greenish-blue?
(a) Lemon
juice (b) Vinegar (c) Common salt (d)
An antacid
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question_answer41)
Which of the following gives the correct
increasing order of acid strength?
(a) Water
< acetic acid < hydrochloric acid (b) Water <
hydrochloric acid < acetic acid
(c) Acetic
acid < water < hydrochloric acid (d) Hydrochloric acid <
water < acetic acid
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question_answer42)
If a few drops of a concentrated acid
accidentally spills over the hand of a student, what should be done?
(a) Wash
the hand with saline solution
(b) Wash
the hand immediately with plenty of water and apply a paste of sodium hydrogen
carbonate
(c)
After washing with plenty of water apply solution of sodium hydroxide on the hand
(d)
Neutralise the acid with a strong alkali
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question_answer43)
Sodium hydrogen carbonate when added to
acetic acid evolves a gas. Which of the following statements are true about the
gas evolved?
(i) It
turns lime water milky.
(ii) It
extinguishes a burning splinter.
(iii)It
dissolves in a solution of sodium hydroxide.
(iv) It
has a pungent odour.
(a)
(i) and (ii) (b) (i), (ii) and (iii) (c) (ii),
(iii) and (iv) (d) (i) and (iv)
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question_answer44)
CO2
turns lime water milky, :it is a non-supporter of combustion and is absorbed by
strong alkalies like NaOH.
Common salt besides being used in
kitchen can also be used as the raw material for making
(i) washing
soda (ii) bleaching powder
(iii)
baking soda (iv) slaked lime
(a)
(i) and (ii) (b) (i), (ii) and (iv) (c) (i),
(ii) and (iii) (d) (i), (iii) and (iv)
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question_answer45)
One of the constituents of baking powder
is sodium hydrogen carbonate, the other constituent is
(a)
hydrochloric acid (b) tartaric acid (c) acetic
acid (d) sulphuric acid
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question_answer46)
To protect tooth decay we are advised to
brush our teeth regularly. The nature of the tooth paste commonly used is
(a)
acidic (b) neutral (c)
basic (d) corrosive
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question_answer47)
Which of the following statements is
correct about an aqueous solution of an acid and a base?
(i) Higher
the pH, stronger the acid (ii) Higher the pH,
weaker the acid
(iii) Lower
the pH, stronger the base (iv) Lower the pH, weaker the
base
(a)
(i) and (iii) (b) (ii) and (iii) (c) (i)
and (iv) (d) (ii) and (iv)
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question_answer48)
The pH of the gastric juices released
during digestion is
(a) less
than 7 (b) more than 7 (c) equal to
7 (d) equal to 0
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question_answer49)
Which of the following phenomena occur,
when a small amount of acid is added to water?
(i) Ionisation (ii)
Neutralisation
(iii)
Dilution (iv) Formation
(a)
(i)and(ii) (b) (i) and (iii) (c)
(ii) and (iii) (d) (ii) and (iv)
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question_answer50)
Which one of the following can be used
as an acid-base indicator by a visually impared student?
(a) Litmus
(b) Turmeric (c) Vanilla
essence (d) Petunia leaves
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question_answer51)
Which of the following substances will
not give carbon dioxide on treatment with dilute acid?
(a)
Marble (b) Limestone (c) Baking
soda (d) Lime
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question_answer52)
Which of the following is acidic in
nature?
(a)
Lime juice (b) Human blood (c) Lime
water (d) Antacid
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question_answer53)
In an attempt to demonstrate electrical
conductivity through an electrolyte, the following apparatus (figure) was set
up.
Which
among the following statement(s) is/are correct?
(i) Bulb
will not glow because electrolyte is not acidic.
(ii)
Bulb will glow becauseis
a strong base and furnishes ions for conduction.
(iii)
Bulb will not glow because circuit is incomplete.
(iv)
Bulb will not glow because it depends upon the type of electrolytic solution.
(a)
(i) and (iii) (b) (ii) and (iv) (c) Only
(ii) (d) Only (iv)
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question_answer54)
Which of the following is used for
dissolution of gold?
(a)
Hydrochloric acid (b) Sulphuric acid (c) Nitric acid (d)
Aqua-regia
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question_answer55)
Which of the following is not a mineral
acid?
(a)
Hydrochloric acid (b) Citric acid (c) Sulphuric
acid (d) Nitric acid
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question_answer56)
Which among the following is not a base?
(a) (b) (c) (d)
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question_answer57)
Which of the following statements is not
correct?
(a) All
metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All
metal oxides react with water to give salt and acid
(c) Some
metals react with acids to give salt and hydrogen
(d) Some
non-metal oxides react with water to form an acid
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question_answer58)
Match the chemical substances given in
Column I with their appropriate application given in Column II.
Column I
|
Column II
|
A. Bleaching powder
B. Baking soda
C. Washing soda
D. Sodium chloride
|
1. Preparation of
glass
2. Production of H2
andCl2
3. De colourisation
4. Antacid
|
Codes
A B C D
(a) 2
1 4 3
(b) 3 2 4 1
(c) 3 4 1 2
(d) 2 4 1 3
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question_answer59)
Equal volumes of hydrochloric acid and
sodium hydroxide solutions of same concentration are mixed and the pH of the
resulting solution is checked with a pH paper. What would be the colour
obtained? (You may use colour guide given in figure of NCERT Book (Science
Class X) on page26).
(a)
Red (b) Yellow (c)
Yellowish green (d) Blue
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question_answer60)
Which of the following is/are true when
HCl (g) is passed through water
(i) It
does not ionise in the solution as it is a covalent compound.
(ii) It
ionises in the solution.
(iii) It
gives both hydrogen and hydroxyl ion in the solution.
(iv) It
forms hydronium ion in the solution due to the combination of hydrogen ion with
water molecule.
(a)
Only (i) (b) Only (iii) (c)
(ii) and (iv) (d) (iii) and (iv)
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question_answer61)
Which of the following statement is true
for acids?
(a) Bitter
and change red litmus to blue (b) Sour and change red litmus to
blue
(c) Sour
and change blue litmus to red (d) Bitter and change blue
litmus to red
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question_answer62)
Which of the following are present in a
dilute aqueous solution of hydrochloric acid?
(a) (b) (c) (d)
Unionized HCI
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question_answer63)
Identify the correct representation of
reaction occurring during chloralkali process.
(a)
(b)
(c)
(d)
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question_answer64)
Match the adds given in Column I with
their correct source given in Column II
Column I
|
Column II
|
A. Lactic acid
B. Acetic acid
c. Citric acid
D. Oxalic acid
|
1. Tomato
2. Lemon
3. Vinegar
4. Curd
|
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question_answer65)
Match the important chemicals given in
Column I with the chemical formulae given in Column II.
Column I
|
Column II
|
A. Plaster of Paris
B. Gypsum
C. Bleaching powder
D. Slaked lime
|
1.
2.
3.
4.
|
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question_answer66)
What will be the action of the following
substances on litmus paper? Dry HCl gas, moistened NH3 gas, lemon
juice, carbonated soft drink, curd, soap solution.
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question_answer67)
Name the add present in ant sting and
give its chemical formula. Also give the common method to get relief from the
discomfort caused by the ant sting.
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question_answer68)
What happens when nitric acid is added
to egg shell?
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question_answer69)
A student prepared solutions of (i) an
acid and (ii) a base in two separate beakers. She forgot to label the solutions
and litmus paper is not available in the laboratory. Since, both the solutions
are colourless, how will she distinguish between the two?
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question_answer70)
How would you distinguish between baking powder and washing soda by heating?
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question_answer71)
Salt A commonly used in bakery products
on heating gets converted in to another salt B which itself is used for removal
of hardness of water and a gas C is evolved. The gas C when passed through lime
water, turns it milky. Identify A, B and C.
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question_answer72)
In one of the industrial processes for
manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X
reacts with lime water to give a compound Y which is used as a bleaching agent
in chemical industry. Identify X and Y giving the chemical equation of the
reactions involved.
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question_answer73)
Fill
in the missing data in the given table.
Name of the salt
|
Formula
|
Salt obtained
from
|
Base
|
Acid
|
(i) Ammonium
chloride
|
|
|
?
|
(ii) Copper sulphate
sodium
|
?
|
?
|
|
(iii) Sodium
chloride
|
|
|
?
|
(iv) Magnesium
nitrate
|
|
?
|
|
(v) Potassium
sulphate
|
|
?
|
?
|
(v) Calcium sulphate
|
|
|
?
|
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question_answer74)
What are strong and weak acids? In the following
list of acids, separate strong acids from weak acids. Hydrochloric acid, citric
acid, acetic acid, nitric acid, formic acid, sulphuric acid.
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question_answer75)
When zinc metal is treated .with a
dilute solution of a strong acid, a gas is evolved, which is utilized in the
hydrogenation of oil. Name the gas evolved. Write the chemical equation of the
reaction involved and also write a test to detect the gas formed.
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question_answer76)
In the following schematic diagram for
the preparation of hydrogen gas as shown in the figure, what would happen if
the following changes are made?
(a) In
place of zinc granules, same amount of zinc dust is taken in the test tube.
(b)
Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
(c) In
place of zinc, copper turnings are taken.
(d)
Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is
heated.
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question_answer77)
For making cake, baking powder is taken.
If at home your mother uses baking soda instead of baking powder in cake.
(a) How
will it affect the taste of the cake and why?
(b) How
can baking soda be converted into baking powder?
(c) What
is the role of tartaric acid added to baking soda?
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question_answer78)
A
metal carbonate X on reacting with an acid gives a gas which when passed
through a solution Y gives the carbonate back. On the other hand, a gas G that
is obtained at anode during electrolysis of brine passed on dry Y, it gives a
compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.
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question_answer79)
A dry pellet of a common base B, when
kept in open absorbs moisture and turns sticky. The compound is also a
by-product of chlor-alkali process. Identify B, what type of reaction occurs
when B is treated with an acidic oxide? Write a balanced chemical equation for
one such solution.
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question_answer80)
A sulphate salt of group 2 element of
the periodic table is a white, soft substance, which can be moulded into
different shapes by making its dough. When this compound is left in open for
some time, it becomes a solid mass and cannot be used for moulding purposes. Identify
the sulphate salt and why does it show such a behaviour? Give the reaction involved.
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question_answer81)
Identify the compound X on the basis of
the reactions given below. Also, write the name and chemical formulae of A, B
and C.
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