CBSE Class 10 Science Chapter-2 Acids, Bases and Salts Important Questions – Free PDF Download
Free PDF download of Important Questions with Answers for CBSE Class 10 Science Chapter 2 – Acids, Bases and Salts prepared by expert Science teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board examination.
CBSE Class 10 Science Acids, Bases and Salts Chapter-2 Important Questions
CBSE Class 10 science Important Questions Chapter 2 – Acids, Bases and Salts
1 Mark Questions
1. An acid can react with
(a) 
(b)
(c)
(d) 
Ans. (b)
2. Which of the following gives 
on heating?
(a) Slaked
(b) Quick lime
(c) Lime stone
(d) Soda ash.
Ans. (c) Lime stone
3. Plaster of Paris is made from
(a) Lime stone
(b) Slaked Lime
(c) Quick lime
(d) Gypsum
Ans. (d) Gypsum
4. Which is a base and not alkali?
(a) 
(b) 
(c) 
(d) None
Ans. (c)
5. Chemical formula of baking soda is
(a) 
(b)
(c) 
(d) 
Ans. (c)
6. The H+ ion concentration of a solution is
. The solution is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
Ans. (a) Acidic
7. An aqueous solution with pH-zero is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
Ans. (a) Acidic
8. Setting of Plaster of Paris takes place due to
(a) Oxidation
(b) Reduction
(c) Dehydration
(d) Hydration
Ans. (d) Hydration
9. The difference of water molecules is gypsum and Plaster of Paris is
(a) 
(b) 
(c) 
(d) 
Ans. (d)
10. The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
Ans. (c) Vinegar
11. Washing soda has the formula
(a) 
(b)
(c)
(d)
Ans. (b)
12. Plaster of Paris hardens by
(a) Giving off
(b)Changing into 
(c) Combining with water
(d) Giving out water
Ans. (c) Combining with water
13. Which of the following is evolved when is heated?
(a) CO2
(b) CO
(c) O2
(d) No
Ans. (d) No
14. 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.
Ans. (c) Sodium bicarbonate
15. If pH of solution is 13, it means that if is
(a) Weakly acidic
(b) Weakly basic
(c) Strongly acidic
(d) Strongly Basic
Ans. (d) Strongly Basic
16. How is concentration of hydronium ions (H3O+) affected when a solution of acid is diluted?
Ans. Concentration of hydronium ions decreased when the solution of an acid is diluted.
17. What effect does the concentration of H+ ions have on the nature of the solution?
Ans. Higher the concentration of H+ ions, greater is the acidic nature of the solution.
18. What effect does the concentration of H+ ions have on the nature of the solution?
Ans. Higher the concentration of H+ ions, greater is the acidic nature of the solution.
19. What is the common name of the compound CaOCl2?
Ans. Bleaching powder.
20. Name the substance which on treatment with chlorine yields bleaching powder.
Ans. Slaked lime or calcium hydroxide.
21. Name the sodium compound which is used for softening hard water.
Ans. Sodium carbonate is used for softening hard water.
22. A solution turns red litmus blue, its pH is likely to be
(a) 1
(b) 4
(c) 5
(d) 10
Ans. (d) 10
23. 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
Ans. (b) HCl
24. 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
Ans. (d) 16 mL
25. Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotics
(b) Analgesic
(c) Antacid
(d) Antiseptic
Ans. (c) Antacid
26. Five solutions A, B, C, D and E when tested with universal indicators 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
Ans. (a) D
(b) C
(c) B
(d) A
(e) E
27. ‘A’ is a soluble acidic oxid and ‘B’ is a soluble base. Compared to pH of pure water. What will be the pH of (a) solution of A (b) solution of B?
Ans. pH of a will be less than 7 and that of B will be more than 7.