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question_answer1) What is the pH of gastric juice, which is released during digestion?
question_answer2) Why sodium carbonate is a basic salt?
question_answer3) Which gas is evolved when sodium hydrogen carbonate is added to acetic acid?
question_answer4) Out of two salts baking soda and washing soda, which salt does not contain water of crystallisation?
question_answer5) What happens when a solution of an acid is mixed with a solution of a base in the test tube?
question_answer6) In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus was set up. What would you suggest, the bulb will glow in this case or not?
question_answer7) If a few drops of concentrated acid accidentally spills over the hand of a student, what should be done?
question_answer8) What is the correct method of finding the pH of a solution?
question_answer9) A few drops of liquid ?Y were added to distilled water. It was observed that the pH of the water decreased. What the liquid sample X could be?
question_answer10) Out of and , which solution has higher value of pH?
question_answer11) A student has four samples A, B, C, D containing dil. , aq , dil. NaOH and distilled water. Which two samples would show equal value of pH?
question_answer12) On adding methyl orange to solution A, it imparts a pink colour and on adding it to solution B, a yellow colour is obtained. Write the nature of solution A and B.
question_answer13) A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and hydrochloric acid under different conditions as shown here. In which set up, no gas is evolved?
question_answer14) The zinc metals used in the laboratory for doing experiments is available in which form, zinc granules or zinc strips?
question_answer15) Four set ups as given below are arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules. Which is the most appropriate set up?
question_answer16) Four experimental set ups are shown below to study the reaction of HCl and NaOH on zinc and sodium carbonate. Which would be the set-up (s) that would result in rapid evolution of gas would be?
question_answer17) Name any salt which does not contain water of crystallisation?
question_answer18) Which gas would be evolved, if sodium bicarbonate is treated with tartaric acid?
question_answer19) A student took test tubes containing 2 mL of dilute HCl and add Zn granules to test tube (A) and solid sodium carbonate to test tube (B) as shown below. What would be the correct observation given by the student?
question_answer20) What would be the colour of litmus in a solution of sodium carbonate?
question_answer21) Name a carbonate of a metal which has cleansing properties.
question_answer22) Write the name and chemical formula of the products formed by heating gypsum at 373 K.
question_answer23) The pH of a sample of vegetable soup was found to be 6.5. How is the soup likely to taste?
question_answer24) Which bases are called alkalies? Give an example of alkali.
question_answer25) Write the name and chemical formula of the products formed by the action of chlorine on slaked lime.
question_answer26) Write a balanced chemical equation for the reaction between sodium carbonate and hydrochloric acid indicating the physical state of the reactants and the products.
question_answer27) Write the balanced chemical equation for a neutralisation reaction, mentioning the physical state of the reactants and the products.
question_answer28) (a) Name the acid present in the ant sting and give its chemical formula. (b) Also give the common method to get relief from the discomfort caused by the ant Sting.
question_answer29) What happens when nitric acid is added to egg shell?
question_answer30) What effect does an increase in concentration of (aq) in a solution have on the pH of solution?
question_answer31) Which one of these has a higher concentration of ions : 1M HCl or 1M?
question_answer32) Why does 1M HCl solution have a higher concentration of ions than 1M solution?
question_answer33) Name the gas usually liberated when a dilute acid reacts with a metal. What happens when a burning candle is brought near the gas?
question_answer34) How does acetic acid help in the preservation of food?
question_answer35) Two solutions A and B have pH values of 5 and 8 respectively. Which solution will be basic in nature?
question_answer36) How will you test a gas which is liberated when hydrochloric acid reacts with an active metal?
question_answer37) How does the flow of acid rain water into a river makes the survival of aquatic life in the river difficult?
question_answer38) Arrange the following in an increasing order of their pH values NaOH solution, blood, lemon juice.
question_answer39) Name the gas evolved when dilute sulphuric acid acts on sodium carbonate.
question_answer40) Which byproduct of chlor-alkali process is used for manufacture of bleaching powder?
question_answer41) Why is acetic acid called a weak acid though there are four H atoms in the molecule?
question_answer42) How does a strong acid differ from a concentrated acid?
question_answer43) A student dropped few pieces of marble in dilute HC1 contained in a test tube. The evolved gas was passed through lime water. (a) What change would be observed in lime water? (b) Write balanced chemical equation for the above change.
question_answer44) A student prepared solutions of an acid and 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?
question_answer45) How would you distinguish between baking powder and washing soda by heating?
question_answer46) Write two observations you make when quicklime is added to water.
question_answer47) A compound X of sodium is commonly used in kitchen for making crispy pakoras. It is also used for curing acidity in the stomach. Identify X. What is its chemical formula? State the reaction which takes place when it is heated during cooking.
question_answer48) (a) Give Arrhenius definition of an acid and a base. (b) Choose strong acid and strong base from the following
question_answer49) What is observed when sulphur dioxide is passed through (a) water? (b) lime water? Also write chemical equations for the reactions that takes place.
question_answer50) A calcium compound which is a yellowish white powder is used as a disinfectant and also in textile industry. (a) Name the compound. (b) Which gas is released when this compound is left exposed to air?
question_answer51) An aqueous solution turns red litmus solution blue. Excess addition of which solution would reverse the change?
question_answer52) State the pH of distilled water and rain water. Justify your answer with proper reasoning.
question_answer53) Give the chemical names of acid present in (a) Ants (b) Lemon (c) Milk (d) Tomato
question_answer54) Name a metal which reacts with alkali to librate hydrogen. Also give the chemical equation.
question_answer55) What are antacids? Name one compound that can be used as an antacid.
question_answer56) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
question_answer57) Why is tartaric acid added into baking soda to get baking powder?
question_answer58) Choose strong/weak acid and strong/weak bases from the following compounds
question_answer59) Identify the number of replaceable hydrogen ions in the following acids (a) (b) (c) (d) (Replaceable H+ ions).
question_answer60) Name the salts of sulphuric acid.
question_answer61) (a) Name a strong base and a weak base. (b) Name a hydrated salt.
question_answer62) Name a salt of a strong acid and a weak base like . Represent the reaction that takes place.
question_answer63) In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as a byproduct. The gas X react with dry slaked lime to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y.
question_answer64) Why is plaster of Paris written as ? How is possible to have half a water molecule attached to ? (2)
question_answer65) What is acid rain? What is its pH?
question_answer66) Name any four chemicals for which common salt is used as raw material.
question_answer67) Name the ions present in the following salts. Name the acid and base from which they can be obtained. Magnesium sulphate, Sodium carbonate, potassium chloride
question_answer68) A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water. (a) Identify the compound. (b) Write the chemical equation for its preparation. (c) Mention one important use of this compound.
question_answer69) (a) What is an alkali? Give an example. (b) Which of the following substances in water will not show acidic properties? Sugar, alcohol, acetic acid, urea, nitric acid and carbon dioxide.
question_answer70) Baking soda is used in small amount in making bread and cake. It helps to make these soft and spongy. An aqueous solution of baking soda turns red litmus blue. It is also used in soda acid fire extinguisher. Use this information to answer the following questions (a) How does baking soda help to make cakes and bread soft and spongy? (b) How does it help in extinguishing fire? (c) Is the pH value of baking soda solution lower than or higher than 7?
question_answer71) What will be the action of the following substances on litmus paper? (a) Dry HCI gas (b) Moistened gas (c) Lemon juice (d) Carbonated soft drink (e) Curd (f) Soap solution
question_answer72) A tarnished copper vessel begins to shine again when rubbed with lemon. Why?
question_answer73) In one of the industrial processes used for the 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 by giving the chemical equation of the reactions involved.
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.
question_answer75) When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. (a) Name the gas evolved. (b) Write the chemical equation of the reaction involved and also write a test to detect the gas formed.
question_answer76) Answer the following (a) Why is sodium hydrogen carbonate an essential ingredient in most antacids? (b) When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali process?
question_answer77) State the name and function of the acid produced in our stomach. What remedy would you suggest to a person suffering from indigestion, pain and irritation in the stomach? Name the main ingredient of this remedy and state its functions.
question_answer78) A dry pellet of a common base B when kept in open absorbs moisture and turns sticky. The compound is also a byproduct of chlor-alkali process. (a) Identify B. (b) What type of reaction occurs when B is treated with an acidic oxide? (c) Write a balanced chemical equation for one such solution. (b) Neutralisation reaction occurs when B is treated with an acidic oxide. (1)
question_answer79) Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognised?
question_answer80) Write the name and formula of each of the following (a) An acidic salt, (b) A basic salt, (c) A neutral salt
question_answer81) What is the nature of the salt if the pH of its solution is greater than 7? Name the acid and base would be used to prepare the following salts (a) Potassium sulphate (b) Ammonium chloride
question_answer82) A white coloured powder is used by the doctors for supporting fractured bones. (a) Write chemical name of this powder. (b) Write chemical formula. (c) Write chemical equation, when this white powder is mixed with water.
question_answer83) A gas is produced when cone. is added to solid sodium chloride taken in a test tube. The gas coming out through the delivery tube is passed over a dry blue litmus paper and then over a moist blue litmus paper. Record your observations and explain reason with the help of chemical equation.
question_answer84) Why does tooth decay start when the pH of mouth is lower than 5.5?
question_answer85) What is baking powder? How does it make the cake soft and spongy?
question_answer86) (a) Dry ammonia has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so? (b) What is the colour of methyl orange in baking soda?
question_answer87) (a) What happens when crystals of washing soda are left open in dry air? (b) Name the change that takes place. Which two industries are based on the use of 5 washing soda? (c) With the help of balanced chemical equation, state the reaction that takes place when sodium hydrogen carbonate is heated during cooking.
question_answer88) Account for the following (a) Antacid tablets are used by a person suffering from stomach pain (b) Toothpaste is used for cleaning teeth. (c) Dry HCl gas does not change the colour of dry litmus paper.
question_answer89) Name the following (a) Two non-hydrated crystalline salts (b) Two neutral salts (c) Two basic salts (d) Two acid salts
question_answer90) While eating food, you happen to spill some curry on your white shirt. You immediately scrub it with soap. What happens to its yellow colour on scrubbing with soap? Why? What happens to this stain when the shirt is washed with plenty of water?
question_answer91) A first aid manual suggests that vinegar should be used to treat wasp stings and baking soda for bee stings. (a) What does this information tell you about the chemical nature of wasp stings? (b) If baking soda is not available, what other substance could you use to treat bee stings?
question_answer92) What pH do you expect for the following salts solutions and why?
question_answer93) What is meant by 'water of crystallisation' of a substance? Describe an activity to show that blue copper sulphate crystals contain water of crystallisation.
question_answer94) One day Lucky's mother after taking meal felt pain and irritation in her stomach. His father was out of station. He was an intelligent boy. He remembered his teacher's statement and gave her mother some baking soda solution, which gave her a relief from pain and irritation of stomach. Read the above passage and answer the following questions (a)Which information given by the teacher helped him to select the baking soda as remedy? (b) Why he selects baking soda as a cure? (c) Suggest any other substance that can be used as a remedy instead of baking soda. (d) State any two values that you have learned from this passage.
question_answer95) One day a magician came in a village. He said that he can cook rice without using flame. He took an empty pot and put some rice in it. He added water to the pot and after sometime, he took the rice out. The rice were cooked. The villagers were surprised but Seema, a girl of that village, was not. She also performed the same magic and told that it is a science not, a magic. Read the given passage and answer the following questions (a) Give three qualities exhibited by Seema in the above passage. (b) How she cooked the rice without using flame?
question_answer96) A metal carbonate X on heating with an acid gives a gas which when passed through a solution Y gives the carbonate back. On other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z.
question_answer97) How do metal carbonates and metal hydrogen carbonates react with acids ?
question_answer98) (a) With the help of a labelled diagram demonstrate an experiment to show the reaction between sodium carbonate and dilute hydrochloric acid. (b) Name the gas evolved. (c) Suggest the test for the gas evolved. (d) Write equation of the chemical reactions involved.
question_answer99) Write the formulae of the salts given below Potassium sulphate, sodium sulphate, calcium sulphate, magnesium sulphate, copper sulphate, sodium chloride, sodium nitrate, sodium carbonate, ammonium chloride and magnesium chloride. Identify the acids and bases from which the above salts may be obtained. How many families can you identify among these salts ?
question_answer100) Write the chemical name of and Write the significance of . Mention the term used for water molecules attached with a salt. With the help of chemical equation, explain the method of preparation of both and Also list two uses of
question_answer101) (a) Why is plaster of Paris written as ? How is it possible to have half water molecule attached to ? (b) State one difference between strong electrolyte and weak electrolyte giving one example of each. (c) When electricity is passed through the aqueous solution of sodium chloride, three products are obtained. Why is this process called chlor-alkali?
question_answer102) It has been observed that dry hydrogen chloride gas does not turn blue litmus red whereas hydrochloric acid does. Explain this observation with the help of an activity and state the reason behind it.
question_answer103) Name the acid present in vinegar.
question_answer104) Name two salts that are used in black and white photography.
question_answer105) Two solutions A and B have pH values of 5 and 8 respectively. Which solution will be basic in nature [CBSE Delhi 2008]
question_answer106) If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done? [NCERT Exemplar]
question_answer107) If someone is suffering from the problem of acidity after overeating; which of the following would you suggest as a remedy? Lemon juice. Baking soda solution or Vinegar.
question_answer108) Arrange the following in the increasing order of acidic strength. Acetic acid, water and hydrochloric acid
question_answer109) Why does tooth decay start when the pH of mouth is lower than 5.5? [CBSE Delhi 2009]
question_answer110) Two solutions X and Y have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
question_answer111) A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. The colour of the solution changes to red, what is the nature of the fruit?
question_answer112) Why does dry HC1 gas not change the colour of the dry litmus paper? [NCERT]
question_answer113) Explain why an aqueous solution of ammonium chloride is acidic in nature.
question_answer114) What effect does the concentration of H+(aq) ions have on the acidic nature of the solution? [NCERT]
question_answer115) How is concentration of hydroxide ions (OH-) affected when excess base is dissolved in a solution of sodium hydroxide? [NCERT]
question_answer116) How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted? [NCERT, CBSE Delhi 2008C]
question_answer117) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why? [CBSE Delhi 2009]
question_answer118) A white chemical compound becomes hard on mixing proper quantity of water. It is also used in surgery to maintain joints in a fixed position. Name the chemical compound.
question_answer119) Which one of these has a higher concentration of H+ ions? 1MHCl or lMCH3COOH [CBSE (AI) 2009]
question_answer120) Why does an aqueous solution of an acid conduct electricity? [NCERT]
question_answer121) Do basic solutions also have H+(ag) ions? If yes, then why are these solutions basic? [NCERT]
question_answer122) In addition to sodium hydrogen carbonate, baking powder contains a substance X. Name the substance X.
question_answer123) What is the commercial name of calcium sulphate hemihydrate?
question_answer124) Name the substance obtained by the action of chlorine on dry slaked lime.
question_answer125) Which is the real bleaching agent present in bleaching powder?
question_answer126) How many molecules of water of crystallization are there in (i) copper sulphate crystals, (ii) washing soda crystals?
question_answer127) Why does the milkiness disappear on passing excess of carbon dioxide to lime water?
question_answer128) Why should curd and sour substances not be kept in brass and copper vessels? [NCERT]
question_answer129) An aqueous solution turns red litmus solution blue. Excess addition of which solution would reverse the change ammonium hydroxide solution or hydrochloric acid?
question_answer130) Why is the electrolysis of a concentrated solution of sodium chloride known as chloralkali process?
question_answer131) What is an olfactory indicator? Name two such indicators.
question_answer132) List in tabular form of two differences between an acid and a base based on their chemical properties.
question_answer133) Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A while acetic acid is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why? [NCERT]
question_answer134) A milkman adds a very small amount of baking soda to fresh milk. (i) Why does he shift the pH of the fresh milk from 6 to slightly alkaline? (ii) Why does this milk take a long time to set as curd? [NCERT]
question_answer135) Five solutions A, B, C, D and E 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? Arrange the pH in increasing order of hydrogen ion concentration. [NCERT]
question_answer136) What happens when a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide? Write the equation of the reaction which takes place.
question_answer137) Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognized? [CBSE Delhi 2008]
question_answer138) 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 and also write a test to detect the gas formed. [NCERT Exemplar]
question_answer139) Why does distilled water not conduct electricity, whereas rain water does?[NCERT]
question_answer140) The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils should be treated with powdered chalk to adjust its pH and why?
question_answer141) Why do acids not show acidic behaviour in the absence of water? [NCERT]
question_answer142) What is 'baking powder'? How does it make the cake soft and spongy? [CBSE Delhi 2008]
question_answer143) Which acid is produced in our stomach? What happens if there is an excess of acid in the stomach? How can its effect be cured?
question_answer144) Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character? [NCERT]
question_answer145) 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 tube? [NCERT]
question_answer146) The conditions preferred by some plants are Plant pH Apple 5.0 - 6.5 Potato 4.5 - 6.0 Black currant 6.0 - 8.0 Mint 7.0 - 8.0 Onion 6.0 - 7.0 Strawberry 5.0 - 7.0 Lettuce 6.0 - 7.0 (a) Which plants grow well over the largest range of pH values? (b) Which plant can grow in the most acidic soil? (c) Which plant can grow in the basic soil?
question_answer147) Under what soil condition do you think a farmer would treat the soil of his field with quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)? [NCERT]
question_answer148) To the three solutions listed below, a few drops of phenolphthalein and blue litmus were added separately. Specify the colour change in each case, if any: Name of the solution Colour change with phenolphthalein Colour change with blue litmus (a) Sodium carbonate (b) Hydrochloric acid (c) Sodium chloride
question_answer149) A salt X when dissolved in distilled water gives a clear solution which red litmus blue. Explain this phenomenon.
question_answer150) A metal compound A reacts with dilute hydrochloric acid to produce effervi The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride [NCERT]
question_answer151) With the help of a chemical equation, explain how a soda-acid fire extinguisher helps in putting out a fire. A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals? [CBSE Delhi 2009]
question_answer152) Plaster of Paris should be stored in a moisture-proof container. Explain why. [NCERT]
question_answer153) (i) Name the products formed when sodium hydrogen carbonate is heated. (ii)Write the chemical equation for the reaction involved in (i). [CBSE (AI) 2009]
question_answer154) What is meant by water of crystallization? Explain that the crystalline salts contain water of crystallization.
question_answer155) You have two solutions A and B. The pH of the solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of these is acidic and which one is basic? [NCERT]
question_answer156) Name the acid present in an ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting. [NCERT Exemplar]
question_answer157) What happens when nitric acid is added to an eggshell? [NCERT Exemplar]
question_answer158) (i) Write the formula and chemical name of bleaching powder. (ii)Write chemical equation to represent the action of atomospheric CO2 gas on bleaching powder when left exposed in open. (iii) State for what purpose is bleaching powder used in water treatment plants. [CBSE Delhi 2007]
question_answer159) How would you distinguish between baking powder and washing soda by heating? [NCERT Exemplar]
question_answer160) Salt A commonly used in bakery products on heating gets converted into 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. [NCERT Exemplar]
question_answer161) 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. [NCERT Exemplar]
question_answer162) (i) In the following schematic diagram for the preparation of hydrogen gas as shown in shown in figure, what would happen if 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)Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated. (ii) How do metal carbonates and metal hydrogen carbonates react with acids? [NCERT Exemplar]
question_answer163) 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 is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G and Z. [NCERT Exemplar]
question_answer164) Write word equations and then balanced equations for the reactions taking place when (a) dilute sulphuric acid reacts with zinc granules. (b) dilute hydrochloric acid reacts with magnesium ribbon. (c) dilute sulphuric acid reacts with aluminium powder. (d) dilute hydrochloric acid reacts with iron filings. (e) a solution of sodium hydrogen carbonate is heated. [NCERT]
question_answer165) Write the formulae of the salts given below. Potassium sulphate, sodium sulphate, calcium sulphate, magnesium sulphate, copper sulphate, sodium chloride, sodium nitrate, sodium carbonate and ammonium chloride. Identify the acids and bases from which the above salts may be obtained. How many families can you identify among these salts?
question_answer166) 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 state why does it show such a behaviour. Give the reaction involved. [NCERT Exemplar]
question_answer167) Why is acetic acid called a weak acid though there are four hydrogen atoms in the molecule?
question_answer168) In one of the industrial processes used 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 [NCERT Exemplar]
question_answer169) A baker found that the cake prepared by him is hard and small in size. Which ingredient had he forgotten to add that would have caused the cake to rise and become light? Give reason.
question_answer170) 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. [NCERT Exemplar]
question_answer171) A compound 'A' is used in fire extinguishers as an antacid and its small amount is also used in making bakery items. Identify the compound and also explain the reason for above mentioned uses of the compound 'A'.
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