Acid bases and salts class 10 MCQs

30 min
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1. Which ion is responsible for the acidic nature of a substance?
(A) OH⁻
(B) Cl⁻
(C) H⁺
(D) Na⁺

2. Which of the following is a strong base?
(A) NH₄Cl
(B) CH₃COOH
(C) H₂CO₃
(D) NaOH

3. A substance that turns blue litmus red is generally a:
(A) Acid
(B) Salt
(C) Base
(D) Neutral solution

4. Which gas is released when acids react with metals?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Hydrogen

5. Which of the following is an example of a weak acid?
(A) HCl
(B) CH₃COOH
(C) HNO₃
(D) H₂SO₄

6. The pH value of a neutral solution is:
(A) 7
(B) 0
(C) 14
(D) 1

7. Which of the following is a natural indicator?
(A) Methyl orange
(B) Litmus
(C) Phenolphthalein
(D) Red oxide

8. Baking soda is chemically:
(A) Sodium carbonate
(B) Magnesium hydroxide
(C) Calcium carbonate
(D) Sodium bicarbonate

9. Which salt is formed from HCl and NaOH?
(A) NaCl
(B) Na₂CO₃
(C) Na₂SO₄
(D) KCl

10. Which of the following has a pH less than 7?
(A) Soap solution
(B) Baking soda
(C) Vinegar
(D) Bleach

11. A base reacts with an acid to form:
(A) Salt + Water
(B) Metal
(C) Hydrogen
(D) Oxides

12. Milk of magnesia is used to treat acidity because it is:
(A) Acidic
(B) Basic
(C) Neutral
(D) A salt

13. Which salt causes hardness in water?
(A) NaCl
(B) KCl
(C) AgCl
(D) CaCO₃

14. Which acid is present in lemon?
(A) Acetic acid
(B) Formic acid
(C) Citric acid
(D) Tartaric acid

15. The process of forming salt by acid–base reaction is called:
(A) Crystallization
(B) Oxidation
(C) Neutralization
(D) Sublimation

16. Which is a characteristic of bases?
(A) Turn red litmus blue
(B) Sour taste
(C) Corrode metals strongly
(D) Release CO₂ with carbonates

17. Common salt is obtained from seawater by:
(A) Evaporation
(B) Filtration
(C) Freezing
(D) Distillation

18. Which acid is present in vinegar?
(A) Acetic acid
(B) Citric acid
(C) Tartaric acid
(D) Sulfuric acid

19. Which of the following is a neutral salt?
(A) NH₄Cl
(B) NaCl
(C) CH₃COONa
(D) Na₂CO₃

20. Which acid is produced in the stomach?
(A) H₂SO₄
(B) HCl
(C) HNO₃
(D) CH₃COOH

21. Which indicator turns pink in basic solutions?
(A) Phenolphthalein
(B) Litmus
(C) Methyl orange
(D) Turmeric

22. Turmeric turns red in:
(A) Acid
(B) Base
(C) Salt
(D) Neutral solution

23. Plaster of Paris is chemically:
(A) Na₂SO₄
(B) CaCO₃
(C) CaSO₄·½H₂O
(D) MgCO₃

24. The pH of a strong base is usually:
(A) Less than 3
(B) Greater than 11
(C) Around 7
(D) Between 4 and 6

25. Which of the following acids is used in car batteries?
(A) Sulfuric acid
(B) Nitric acid
(C) Carbonic acid
(D) Hydrochloric acid

26. Washing soda is chemically:
(A) Na₂CO₃·10H₂O
(B) NaHCO₃
(C) CaCO₃
(D) Mg(OH)₂

27. Which salt is used in making toothpastes?
(A) CaSO₄
(B) CaCO₃
(C) NaCl
(D) K₂SO₄

28. A solution with pH = 2 is:
(A) Neutral
(B) Weakly acidic
(C) Strongly basic
(D) Strongly acidic

29. Lactic acid is found in:
(A) Lemons
(B) Milk
(C) Ant bites
(D) Grapes

30. Tooth decay occurs when pH of the mouth falls below:
(A) 9
(B) 7
(C) 5.5
(D) 11