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MCQ Questions for Class 10 Science: Ch 2 Acids, Bases and Salts

1. Chemical formula of baking soda is:
(a) MgSO4
(b) Na2CO3
(c) NaHCO3
(d) MgCO3
► (c) NaHCO3

2. Plaster of Paris is made from
(a) Lime stone
(b) Slaked Lime
(c) Quick lime
(d) Gypsum
► (d) Gypsum

3. Setting of Plaster of Paris takes place due to
(a) Oxidation
(b) Reduction
(c) Dehydration
(d) Hydration
► (d) Hydration

4. When hydrogen chloride gas is prepared 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 Cl– ions from the evolved gas
► (c) absorb moisture from the gas

5. The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
► (c) Vinegar

6. What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water
► (b) Sodium zincate and hydrogen gas

7. Which one of the following salts does not con-tain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
► (b) Baking soda

8. Brine is an
(a) aqueous solution of sodium hydroxide
(b) aqueous solution of sodium carbonate
(c) aqueous solution of sodium chloride
(d) aqueous solution of sodium bicarbonate
► (c) aqueous solution of sodium chloride

9. An aqueous solution with pH-zero is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
► (a) Acidic

10. Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
► (d) Oxalic acid

11. In terms of acidic strength, which one of the following is in the correct increasing order?
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
► (a) Water < Acetic acid < Hydrochloric acid

12. Sodium carbonate is a basic salt because it is a salt of a
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base
► (d) weak acid and strong base

13. The H + ion concentration of a solution is 1.0×10-5m. The solution is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
► (a) Acidic

14. Na2CO3 . 10H2O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
► (a) washing soda

15. The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
► (c) Vinegar

16. At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
► (b) 100°C

17. Plaster of Paris hardens by
(a) Giving off CO2
(b) Changing into
(c) Combining with water CaCO3
(d) Giving out water
► (c) Combining with water

18. Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda
► (c) baking soda

19. Alkalis are
(a) acids, which are soluble in water
(b) acids, which are insoluble in water
(c) bases, which are insoluble in water
(d) bases, which are soluble in water
► (d) bases, which are soluble in water

20. A drop of liquid sample was put on the pH paper, paper turned blue. The liquid
sample must be of
(a) Lemon Juice
(b) HCl
(c) Sodium bicarbonate
(d) Ethanoic acid.
► (c) Sodium bicarbonate

21. Nettle sting is a natural source of which acid?
(a) MetiWanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
► (a) MetiWanoic acid

22. What is the pH range of human body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4
► (a) 7.0 – 7.8

23. If pH of solution is 13, it means that if is
(a) Weakly acidic
(b) Weakly basic
(c) Strongly acidic
(d) Strongly Basic
► (d) Strongly Basic

24. Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium
► (a) calcium phosphate

25. When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black
► (b) bluish-green

26. Rain is called acid rain when its:
(a) pH falls below 7
(b) pH falls below 6
(c) pH falls below 5.6
(d) pH is above 7
► (c) pH falls below 5.6

27. A solution reacts with crushed egg-shells to give a gas that turns lime-water milkey. The solution contains
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl
► (b) HCl

28. Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid
► (c) strong base

29. Sodium hydroxide is used
(a) as an antacid
(b) in manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
► (b) in manufacture of soap

30. Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
► (a) pink

31. 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
► (d) Hydrochloric acid

32. Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotics
(b) Analgesic
(c) Antacid
(d) Antiseptic
► (c) Antacid

33. 10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of same solution of NaOH, the amount of HCl solution required to neutralize it will be
(a) 4 mL
(b) 8 mL
(c) 12 mL
(d) 16 mL
► (d) 16 mL

34. Which of the following is not a acidic salt?
(a) CuSO4
(b) NH4Cl
(c) FeCl3
(d) CH3COONa
► (d) CH3COONa

35. How many water molecules does hydrated calcium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
► (d) 2

36. Egg shell is made up of
(a) CaCO3
(b) CaO
(c) Ca(OH)2
(d) CaCl2
► (a) CaCO3

37. Which of the following salts does not contain water of crystallisation? [NCERT Exemplar Problems]
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
► (b) Baking soda

38. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking power
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
► (d) Hydrochloric acid

39. 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
► (d) An antacid

40. Calcium phosphate is present in tooth enamel. Its nature is
(a) basic
(b) acidic
(c) neutral
(d) amphoteric
► (a) basic

41. Ag2S reacts with H2SO4 to form
(a) AgSO4
(b) Ag2SO4 + H2S
(c)Ag2O + H2S
(d) AgOH + H2S
► (b) Ag2SO4 + H2S

42. NaHCO, formed by reaction of
(a) NaOH + H2CO3
(b) NaCl + H2CO3
(c) Na2CO3 + HCl
(d) NaOH + Na2CO3
► (a) NaOH + H2CO3

43. Assertion: Ammonium hydroxide is Weak Base
Reason: Phenolphthalein becomes pink in NH2OH
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
► (b) Both A and R are true but R is not the correct explanation of A.

44. Assertion: Universal indicator gives green colour with distilled water.
Reason: pH of distilled water is 7 and it is neutral and universal indicator gives green colour with neutral solution.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
► (a) Both A and R are true and R is the correct explanation of A.

45. Assertion: Bleaching power liberate chlorine when kept in atmosphere.
Reason: CaOCl2 reacts with CO2 present in atmosphere to form CaCO3 and chlorine gas.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
► (a) Both A and R are true and R is the correct explanation of A.
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