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Acids, Bases and Salts Class 10 Foundation MCQ & Practice Questions

Practice Acids, Bases and Salts MCQs for Class 10 Foundation Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Acids, Bases and Salts Revision Guide for Class 10 Foundation Chemistry

Acids, Bases and Salts is part of Class 10 Foundation Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

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Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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Top 20 Acids, Bases and Salts MCQs with Answers

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Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

1. Which species is the strongest acid in aqueous solution?

  • A. HCl
  • B. H₂O
  • C. NH₄⁺
  • D. CH₃COOH
Answer: A
Explanation: HCl is a strong acid and ionises almost completely in water.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

2. A solution of pH 2 is how many times more acidic than a solution of pH 5?

  • A. 3
  • B. 30
  • C. 100
  • D. 1000
Answer: D
Explanation: A difference of 3 pH units means a 10³ = 1000-fold difference in H₃O⁺ concentration.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

3. Which indicator is colourless in acid and pink in alkali?

  • A. Methyl orange
  • B. Phenolphthalein
  • C. Litmus
  • D. Turmeric
Answer: B
Explanation: Phenolphthalein is colourless in acidic medium and pink in basic medium.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

4. Why does dry HCl gas not turn dry blue litmus red?

  • A. HCl is not acidic
  • B. No H₃O⁺ forms without water
  • C. Litmus is basic
  • D. HCl is neutral
Answer: B
Explanation: Acidic behaviour requires ionisation in water to form hydronium ions.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

5. Which reaction is a neutralisation reaction?

  • A. Zn + 2HCl → ZnCl₂ + H₂
  • B. HCl + NaOH → NaCl + H₂O
  • C. CaCO₃ → CaO + CO₂
  • D. AgNO₃ + NaCl → AgCl + NaNO₃
Answer: B
Explanation: An acid and a base react to produce salt and water.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

6. Which gas is evolved when an acid reacts with a carbonate?

  • A. H₂
  • B. O₂
  • C. CO₂
  • D. Cl₂
Answer: C
Explanation: Acid + carbonate gives salt, water, and carbon dioxide.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

7. Which compound is amphoteric?

  • A. Na₂O
  • B. SO₃
  • C. Al₂O₃
  • D. CO₂
Answer: C
Explanation: Aluminium oxide reacts with both acids and bases.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

8. Which salt is formed from a strong acid and strong base?

  • A. NH₄Cl
  • B. CH₃COONa
  • C. NaCl
  • D. Na₂CO₃
Answer: C
Explanation: NaCl is formed from HCl and NaOH.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

9. Which salt gives an acidic solution in water?

  • A. NaCl
  • B. KNO₃
  • C. NH₄Cl
  • D. CH₃COONa
Answer: C
Explanation: NH₄⁺ hydrolyses to produce H₃O⁺.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

10. Which salt gives a basic solution in water?

  • A. NaCl
  • B. NH₄Cl
  • C. CH₃COONa
  • D. KCl
Answer: C
Explanation: Acetate ions hydrolyse to produce OH⁻.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

11. The conjugate base of H₂SO₄ is:

  • A. SO₄²⁻
  • B. HSO₄⁻
  • C. H₃O⁺
  • D. OH⁻
Answer: B
Explanation: Loss of one proton from H₂SO₄ gives HSO₄⁻.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

12. The conjugate acid of NH₃ is:

  • A. NH₂⁻
  • B. NH₄⁺
  • C. N₂H₄
  • D. HNO₃
Answer: B
Explanation: NH₃ accepts a proton to form NH₄⁺.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

13. Which oxide is acidic?

  • A. Na₂O
  • B. MgO
  • C. CO₂
  • D. CaO
Answer: C
Explanation: CO₂ reacts with water to form carbonic acid and with bases to form salts.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

14. Which oxide is basic?

  • A. SO₂
  • B. CO₂
  • C. Na₂O
  • D. NO₂
Answer: C
Explanation: Na₂O forms NaOH with water.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

15. Baking soda is:

  • A. Na₂CO₃
  • B. NaHCO₃
  • C. CaCO₃
  • D. NaOH
Answer: B
Explanation: Baking soda is sodium hydrogen carbonate.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

16. Washing soda is:

  • A. Na₂CO₃·10H₂O
  • B. NaHCO₃
  • C. CaOCl₂
  • D. CaSO₄·½H₂O
Answer: A
Explanation: Washing soda is sodium carbonate decahydrate.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

17. Bleaching powder is commonly represented as:

  • A. CaCO₃
  • B. CaOCl₂
  • C. CaSO₄
  • D. NaCl
Answer: B
Explanation: Bleaching powder is commonly written as CaOCl₂.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

18. Plaster of Paris is:

  • A. CaSO₄·2H₂O
  • B. CaSO₄·½H₂O
  • C. CaCO₃
  • D. CaO
Answer: B
Explanation: Plaster of Paris is calcium sulphate hemihydrate.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

19. Which salt contains water of crystallisation?

  • A. NaCl
  • B. CuSO₄·5H₂O
  • C. KNO₃
  • D. CaCO₃
Answer: B
Explanation: Copper sulphate pentahydrate contains five water molecules.

Class 10 Foundation Chemistry · Acids, Bases and Salts · Very Very Hard

20. A solution has

  • A. 2
  • B. 4
  • C. 10
  • D. 14
Answer: B
Explanation: pH = −log[H⁺] = 4.

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Acids, Bases and Salts Practice Tests

Acids, Bases and Salts Frequently Asked Questions

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