SHORT ANSWER TYPE QUESTIONS
1. What is an acid? Give some examples of organic and inorganic acids.
2. What is a base? Give examples?
3. What is an indicator? Give some examples of indicators?
4. What is litmus?
5. Describe some natural acid-base indicators, other than litmus.
6. What are olfactory indicators?
7. What do you mean by concentrated and dilute acid solutions?
8. Explain why brass and copper vessels are not used to keep curd and sour substances?
9. Name the gas which is liberated when metals react with an acid. Give an example. How is
the presence of the gas tested?
10. HCL, HNO3 etc. show acidic behavior in aqueous solutions but aqueous solutions of
alcohol and glucose do not behave like acids. Explain why?
11. What would be the nature of solutions when the following salts are dissolved separately in
water?
(i) NaCl
(ii) Na2CO3
(iii) CH3COONa
(iv) CuSO4
(v) (NH4)2SO4
(vi) Na2SO4
12. What are the functions of sodium chloride in human body?
13. Given below are the pH values of four different liquids : 7.0, 14.0, 4.0, 2.0
Which of these could be that of
(i) lemon juice.
(ii) distilled water
(iii) 1 M sodium hydroxide solution
(iv) tomato juice
14. Why does an aqueous solutions of an acid conduct electricity?
15. During the dilution of an acid, it is advised that acid should be added to water, not water to
acid. Why?
16. Ac acid solution is diluted with water. How does the concentration of hydrogen ions
change?
17. Wh t is the pH of a solution?
18. A metal compound when treated with dilute hydrochloride acid forms calcium chloride and
a gas. The gas evolved extinguishers a burning splinter. Write the equation for the reaction
that occurs.
19. Why does the colour of dry litmus paper not change in contact with dry HCL gas?
20. How is the concentration of OH–
ions change when excess of base is dissolved in a a
solution of sodium hydroxide?
21. What will happen if solid sodium hydrogencarbonate or a solution of it is heated? Give the
equation of the reaction involved?
22. Give two important uses of washing soda.
23. Give two important uses of baking soda.
24. A baker found that the cake prepared by him was hard and small in size. Which ingredient
had he forgotten to add that would have made the cake fluffy? Give reasons.
25. How is soda ash obtained from washing soda crystals? Support your answer by a chemical
equation.
26. How does a fire extinguisher work?
27. Why is an aqueous solution sodium carbonate alkaline in nature?
28. A given compound of sodium is used to remove hardness of water and also as a reagent in
the laboratory. Identify the compound and mention two of its uses.
29. How is bleaching powder prepared? Give the reaction.
30. What happens when bleaching powder is left exposed to air?
31. State three important uses of bleaching powder?
32. (i) Name the chemical used in hospitals for setting fractured bones.
(ii) State the name of the above chemical and its formula.
(iii) How is the above compound prepared?
33. What is gypsum? What happens when gypsum is heated to 393k?
34. Explain giving reasons: “Potassium hydrogentartrate is a component of baking powder
used in making cakes”.
35. A white amorphous powder emits a greenish yellow gas having a smell of chlorine. It is
used to remove yellowness of white clothes in laundries. Identify the powder. Write the
chemical equation involved in its preparation.
36. You are provided with two solutions A and B having pH 6 and 8 respectively. Which of the
solutions does contain more H+
ion concentration? Which of them is acidic and which one
basic?
37. Do basic solution also have H+
ions. If yes, then why are they basic?
38. Wh t do the farmers do to treat the soil when it becomes too acidic?
39. What effect does a bee-sting produce on human body? What is its remedy?
40. What is the chemical substance injected into a man’s skin when (a) an ant stings him (b) a
nettle-leaf stings him?
Suggest remedy to get relief from the effects of the stings.
41. How are the lives of aquatic animals affected with change in pH of the river water?
42. Explain the following: “Distilled water does not conduct electricity, but rain water does”.
43. Why is an aqueous solution of sodium chloride neutral, whereas that of ammonium
chloride acidic?
44. An efflorescent white, crystalline substance dissolves in water to produce an alkaline
solution. The substance is used as a cleansing agent. Identify the substance and mention
two uses it.
45. A white, powdery compound of calcium is used for making toys and casts of statues. It
hardens when mixed with water. Identify the compound. Write the chemical equation of its
preparation.
46. What is the chemical formula of plaster of paris? How is it prepared? State the common
and the chemical names of the compound formed when plaster of paris mixed w th water?
47. State two uses of the following:
(i) Sodium hydroxide
(ii) Chlorine
(iii) Hydrogen
(iv) Hydrochloric acid
48. (a) What is the common name of the compound CaOCl2.
(b) Name the raw material used for the preparation of plaster of paris.
(c) Which property of plaster of paris is utilized in making casts for broken limbs in
hospitals?
49. What happens when a cold and co centrate solution of sodium chloride reacts with
ammonia and carbon dioxide? Write the chemical equation of the reaction which takes
place.
50. Write the chemical form la of ammonium chloride. Explain why an aqueous solution of
ammonium chlorid is acidic in nature? Illustrate your answer with the help of a chemical
equation.
1. What is an acid? Give some examples of organic and inorganic acids.
2. What is a base? Give examples?
3. What is an indicator? Give some examples of indicators?
4. What is litmus?
5. Describe some natural acid-base indicators, other than litmus.
6. What are olfactory indicators?
7. What do you mean by concentrated and dilute acid solutions?
8. Explain why brass and copper vessels are not used to keep curd and sour substances?
9. Name the gas which is liberated when metals react with an acid. Give an example. How is
the presence of the gas tested?
10. HCL, HNO3 etc. show acidic behavior in aqueous solutions but aqueous solutions of
alcohol and glucose do not behave like acids. Explain why?
11. What would be the nature of solutions when the following salts are dissolved separately in
water?
(i) NaCl
(ii) Na2CO3
(iii) CH3COONa
(iv) CuSO4
(v) (NH4)2SO4
(vi) Na2SO4
12. What are the functions of sodium chloride in human body?
13. Given below are the pH values of four different liquids : 7.0, 14.0, 4.0, 2.0
Which of these could be that of
(i) lemon juice.
(ii) distilled water
(iii) 1 M sodium hydroxide solution
(iv) tomato juice
14. Why does an aqueous solutions of an acid conduct electricity?
15. During the dilution of an acid, it is advised that acid should be added to water, not water to
acid. Why?
16. Ac acid solution is diluted with water. How does the concentration of hydrogen ions
change?
17. Wh t is the pH of a solution?
18. A metal compound when treated with dilute hydrochloride acid forms calcium chloride and
a gas. The gas evolved extinguishers a burning splinter. Write the equation for the reaction
that occurs.
19. Why does the colour of dry litmus paper not change in contact with dry HCL gas?
20. How is the concentration of OH–
ions change when excess of base is dissolved in a a
solution of sodium hydroxide?
21. What will happen if solid sodium hydrogencarbonate or a solution of it is heated? Give the
equation of the reaction involved?
22. Give two important uses of washing soda.
23. Give two important uses of baking soda.
24. A baker found that the cake prepared by him was hard and small in size. Which ingredient
had he forgotten to add that would have made the cake fluffy? Give reasons.
25. How is soda ash obtained from washing soda crystals? Support your answer by a chemical
equation.
26. How does a fire extinguisher work?
27. Why is an aqueous solution sodium carbonate alkaline in nature?
28. A given compound of sodium is used to remove hardness of water and also as a reagent in
the laboratory. Identify the compound and mention two of its uses.
29. How is bleaching powder prepared? Give the reaction.
30. What happens when bleaching powder is left exposed to air?
31. State three important uses of bleaching powder?
32. (i) Name the chemical used in hospitals for setting fractured bones.
(ii) State the name of the above chemical and its formula.
(iii) How is the above compound prepared?
33. What is gypsum? What happens when gypsum is heated to 393k?
34. Explain giving reasons: “Potassium hydrogentartrate is a component of baking powder
used in making cakes”.
35. A white amorphous powder emits a greenish yellow gas having a smell of chlorine. It is
used to remove yellowness of white clothes in laundries. Identify the powder. Write the
chemical equation involved in its preparation.
36. You are provided with two solutions A and B having pH 6 and 8 respectively. Which of the
solutions does contain more H+
ion concentration? Which of them is acidic and which one
basic?
37. Do basic solution also have H+
ions. If yes, then why are they basic?
38. Wh t do the farmers do to treat the soil when it becomes too acidic?
39. What effect does a bee-sting produce on human body? What is its remedy?
40. What is the chemical substance injected into a man’s skin when (a) an ant stings him (b) a
nettle-leaf stings him?
Suggest remedy to get relief from the effects of the stings.
41. How are the lives of aquatic animals affected with change in pH of the river water?
42. Explain the following: “Distilled water does not conduct electricity, but rain water does”.
43. Why is an aqueous solution of sodium chloride neutral, whereas that of ammonium
chloride acidic?
44. An efflorescent white, crystalline substance dissolves in water to produce an alkaline
solution. The substance is used as a cleansing agent. Identify the substance and mention
two uses it.
45. A white, powdery compound of calcium is used for making toys and casts of statues. It
hardens when mixed with water. Identify the compound. Write the chemical equation of its
preparation.
46. What is the chemical formula of plaster of paris? How is it prepared? State the common
and the chemical names of the compound formed when plaster of paris mixed w th water?
47. State two uses of the following:
(i) Sodium hydroxide
(ii) Chlorine
(iii) Hydrogen
(iv) Hydrochloric acid
48. (a) What is the common name of the compound CaOCl2.
(b) Name the raw material used for the preparation of plaster of paris.
(c) Which property of plaster of paris is utilized in making casts for broken limbs in
hospitals?
49. What happens when a cold and co centrate solution of sodium chloride reacts with
ammonia and carbon dioxide? Write the chemical equation of the reaction which takes
place.
50. Write the chemical form la of ammonium chloride. Explain why an aqueous solution of
ammonium chlorid is acidic in nature? Illustrate your answer with the help of a chemical
equation.
