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

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

Acids, Bases and Salts is part of CBSE Class 10 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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CBSE Class 10 Chemistry · Acids, Bases and Salts · Very Very Hard

1. Which ion is responsible for the acidic character of an aqueous acid solution?

  • A. OH⁻
  • B. Na⁺
  • C. H₃O⁺
  • D. Cl⁻
Answer: C
Explanation: Acids produce H⁺ ions in water, which exist mainly as hydronium ions, H₃O⁺.

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

2. Which ion is primarily responsible for the basic character of an aqueous base?

  • A. H₃O⁺
  • B. Cl⁻
  • C. OH⁻
  • D. SO₄²⁻
Answer: C
Explanation: Bases furnish hydroxide ions, OH⁻, in aqueous solution.

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

3. Why does dry hydrogen chloride gas not change the colour of dry blue litmus paper?

  • A. HCl is not acidic
  • B. Litmus is basic only
  • C. Water is required to produce H₃O⁺ ions
  • D. HCl contains OH⁻ ions
Answer: C
Explanation: Without water, HCl does not ionise to form hydronium ions.

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

4. Which substance turns red litmus paper blue?

  • A. Dilute HCl
  • B. Vinegar
  • C. Aqueous NaOH
  • D. Lemon juice
Answer: C
Explanation: Aqueous NaOH is basic and turns red litmus blue.

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

5. Which colour does phenolphthalein develop in a basic solution?

  • A. Red
  • B. Orange
  • C. Pink
  • D. Colourless
Answer: C
Explanation: Phenolphthalein is colourless in acidic solution and pink in basic solution.

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

6. Which colour does methyl orange show in an acidic solution?

  • A. Yellow
  • B. Blue
  • C. Red
  • D. Green
Answer: C
Explanation: Methyl orange is red in acidic medium.

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

7. A solution has pH 3. It is:

  • A. Strongly basic
  • B. Neutral
  • C. Acidic
  • D. Weakly basic
Answer: C
Explanation: Any solution with pH below 7 is acidic.

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

8. A solution has pH 11. It is:

  • A. Acidic
  • B. Neutral
  • C. Basic
  • D. Always a salt solution
Answer: C
Explanation: A pH above 7 indicates a basic solution.

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

9. Which solution has the highest concentration of H₃O⁺ ions?

  • A. pH 2
  • B. pH 5
  • C. pH 1
  • D. pH 7
Answer: C
Explanation: Lower pH means higher hydronium-ion concentration; pH 1 is the lowest listed.

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

10. How many times greater is

  • A. 3 times
  • B. 30 times
  • C. 1000 times
  • D. 500 times
Answer: C
Explanation: Each pH unit represents a tenfold change. A difference of 3 units means 10³ = 1000 times.

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

11. Which equation represents neutralisation?

  • A. Zn + 2HCl → ZnCl₂ + H₂
  • B. CaCO₃ → CaO + CO₂
  • C. HCl + NaOH → NaCl + H₂O
  • D. 2Mg + O₂ → 2MgO
Answer: C
Explanation: An acid and a base react to form salt and water.

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

12. When an acid reacts with a metal carbonate, the products generally include:

  • A. Salt and hydrogen only
  • B. Metal oxide only
  • C. Salt, water and carbon dioxide
  • D. Only carbon dioxide
Answer: C
Explanation: Acid + carbonate → salt + water + carbon dioxide.

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

13. Which gas is evolved when dilute HCl reacts with sodium hydrogen carbonate?

  • A. O₂
  • B. H₂
  • C. CO₂
  • D. Cl₂
Answer: C
Explanation: NaHCO₃ + HCl → NaCl + H₂O + CO₂.

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

14. Which gas gives a 'pop' sound when tested with a burning splint?

  • A. Carbon dioxide
  • B. Oxygen
  • C. Hydrogen
  • D. Nitrogen
Answer: C
Explanation: Hydrogen burns explosively with a characteristic pop sound.

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

15. Which metal generally does not liberate hydrogen from dilute HCl?

  • A. Magnesium
  • B. Zinc
  • C. Copper
  • D. Aluminium
Answer: C
Explanation: Copper is below hydrogen in the reactivity series and cannot displace it from dilute HCl.

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

16. Which oxide reacts with both acids and bases?

  • A. Na₂O
  • B. SO₂
  • C. Al₂O₃
  • D. CO₂
Answer: C
Explanation: Aluminium oxide is amphoteric.

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

17. Which substance is commonly called baking soda?

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

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

18. Which substance is commonly called washing soda?

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

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

19. The formula of bleaching powder is commonly represented as:

  • A. CaCO₃
  • B. Ca(OH)₂
  • C. CaOCl₂
  • D. CaSO₄
Answer: C
Explanation: Bleaching powder is commonly represented by CaOCl₂.

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

20. Bleaching powder is manufactured by passing chlorine over:

  • A. Dry NaCl
  • B. Quicklime
  • C. Dry slaked lime
  • D. Gypsum
Answer: C
Explanation: Chlorine reacts with dry slaked lime, Ca(OH)₂, to form bleaching powder.

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Acids, Bases and Salts Practice Tests

Acids, Bases and Salts Frequently Asked Questions

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