CBSE Class 10 Chemistry Acids, Bases and Salts MCQs Set 03

Chemistry Objective Questions and Answers: Acids, Bases and Salts

Review structured MCQ sets for Class 10 Chemistry Acids, Bases and Salts. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

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Multiple Choice Questions

Question 1: Which are weak acids among \( \ce{H2CO3} \), \( \ce{HNO3} \), \( \ce{CH3COOH} \), \( \ce{HCl} \)?
(a) \( \ce{H2CO3} \) and \( \ce{CH3COOH} \)
(b) \( \ce{HNO3} \) and \( \ce{HCl} \)
(c) \( \ce{H2CO3} \) and \( \ce{HCl} \)
(d) \( \ce{CH3COOH} \) and \( \ce{HNO3} \)
Show Answer & Explanation

Answer: (a) \( \ce{H2CO3} \) and \( \ce{CH3COOH} \)

Explanation:
1. Carbonic and ethanoic acids ionise only partly.
2. Nitric and hydrochloric acids are strong.

Teacher's Note:
1. Strong acids ionise fully.

Question 2: Which pair is of strong bases?
(a) NaOH and KOH
(b) \( \ce{NH4OH} \) and NaOH
(c) \( \ce{Ca(OH)2} \) and \( \ce{NH4OH} \)
(d) \( \ce{NH4OH} \) and \( \ce{Mg(OH)2} \)
Show Answer & Explanation

Answer: (a) NaOH and KOH

Explanation:
1. NaOH and KOH ionise completely.

Teacher's Note:
1. Group 1 hydroxides.

Question 3: Phenolphthalein in a basic solution turns
(a) red
(b) pink
(c) yellow
(d) blue
Show Answer & Explanation

Answer: (b) pink

Explanation:
1. Phenolphthalein is colourless in acid and pink in base.

Teacher's Note:
1. Colourless to pink.

Question 4: Methyl orange in an acid turns
(a) yellow
(b) red
(c) blue
(d) pink
Show Answer & Explanation

Answer: (b) red

Explanation:
1. Methyl orange is red in acids and yellow in bases.

Teacher's Note:
1. Orange to red.

Question 5: Turmeric paper in an acid
(a) turns red
(b) turns blue
(c) shows no change
(d) turns white
Show Answer & Explanation

Answer: (c) shows no change

Explanation:
1. Turmeric turns red only in bases.

Teacher's Note:
1. It changes in bases.

Question 6: Onion and vanilla are examples of
(a) acid-base indicators with colour change
(b) olfactory indicators
(c) strong acids
(d) salts
Show Answer & Explanation

Answer: (b) olfactory indicators

Explanation:
1. Their smell changes in acid or base.

Teacher's Note:
1. Smell based.

Question 7: A student adds sodium carbonate to dilute HCl. The gas that turns lime water milky is
(a) \( \ce{H2} \)
(b) \( \ce{O2} \)
(c) \( \ce{CO2} \)
(d) \( \ce{Cl2} \)
Show Answer & Explanation

Answer: (c) \( \ce{CO2} \)

Explanation:
1. \( \ce{Na2CO3 + 2HCl -> 2NaCl + H2O + CO2} \).

Teacher's Note:
1. Carbonates give carbon dioxide.

Question 8: The pH of a neutral solution at 25 degrees C is
(a) 0
(b) 7
(c) 10
(d) 14
Show Answer & Explanation

Answer: (b) 7

Explanation:
1. Neutral water has equal hydrogen and hydroxide ions, pH 7.

Teacher's Note:
1. Middle of the scale.

Question 9: A solution with pH 2 compared with pH 4 has hydrogen ion concentration
(a) 2 times more
(b) 100 times more
(c) 100 times less
(d) the same
Show Answer & Explanation

Answer: (b) 100 times more

Explanation:
1. Each pH unit is a factor of 10, so two units is a factor of 100.

Teacher's Note:
1. pH is logarithmic.

Question 10: Tooth decay begins when pH of the mouth falls below
(a) 7
(b) 5.5
(c) 3
(d) 9
Show Answer & Explanation

Answer: (b) 5.5

Explanation:
1. Tooth enamel is corroded below pH 5.5.

Teacher's Note:
1. A little under neutral.

Question 11: The chemical formula of baking soda is
(a) \( \ce{Na2CO3} \)
(b) \( \ce{NaHCO3} \)
(c) \( \ce{NaOH} \)
(d) \( \ce{CaCO3} \)
Show Answer & Explanation

Answer: (b) \( \ce{NaHCO3} \)

Explanation:
1. Baking soda is sodium hydrogencarbonate.

Teacher's Note:
1. Hydrogencarbonate.

Question 12: The number of water molecules in plaster of Paris per formula unit is
(a) 2
(b) 1
(c) 0.5
(d) 5
Show Answer & Explanation

Answer: (c) 0.5

Explanation:
1. Formula \( \ce{CaSO4.1/2H2O} \), so half a molecule.

Teacher's Note:
1. Half.

Question 13: Chlor-alkali process gives NaOH along with
(a) \( \ce{Cl2} \) and \( \ce{H2} \)
(b) \( \ce{O2} \) and \( \ce{H2} \)
(c) \( \ce{CO2} \) and \( \ce{Cl2} \)
(d) \( \ce{HCl} \) only
Show Answer & Explanation

Answer: (a) \( \ce{Cl2} \) and \( \ce{H2} \)

Explanation:
1. \( \ce{2NaCl + 2H2O -> 2NaOH + Cl2 + H2} \).

Teacher's Note:
1. Electrolysis of brine.

Question 14: An antacid works by
(a) acting as a weak base
(b) acting as a strong acid
(c) giving off oxygen
(d) being a salt of weak base
Show Answer & Explanation

Answer: (a) acting as a weak base

Explanation:
1. Weak bases such as magnesium hydroxide neutralise excess stomach acid.

Teacher's Note:
1. Neutralisation.

Question 15: Salt of a strong acid and a weak base has pH
(a) exactly 7
(b) above 7
(c) below 7
(d) 14
Show Answer & Explanation

Answer: (c) below 7

Explanation:
1. The salt hydrolyses to give an acidic solution.

Teacher's Note:
1. Acidic salt.

Question 16: Sodium carbonate solution is
(a) acidic
(b) neutral
(c) basic
(d) strongly acidic
Show Answer & Explanation

Answer: (c) basic

Explanation:
1. It is a salt of a weak acid and a strong base.

Teacher's Note:
1. Weak acid, strong base.

Question 17: Neutralisation of NaOH with HCl gives
(a) \( \ce{NaCl + H2O} \)
(b) \( \ce{NaCl + H2} \)
(c) \( \ce{NaClO + H2O} \)
(d) \( \ce{Na2O + HCl} \)
Show Answer & Explanation

Answer: (a) \( \ce{NaCl + H2O} \)

Explanation:
1. Acid plus base gives salt and water.

Teacher's Note:
1. Salt and water.

Question 18: The acid present in tamarind is
(a) citric
(b) tartaric
(c) lactic
(d) oxalic
Show Answer & Explanation

Answer: (b) tartaric

Explanation:
1. Tamarind contains tartaric acid.

Teacher's Note:
1. Starts with t.

Question 19: Which is a hydrated salt?
(a) NaCl
(b) \( \ce{CuSO4.5H2O} \)
(c) KCl
(d) \( \ce{CaCO3} \)
Show Answer & Explanation

Answer: (b) \( \ce{CuSO4.5H2O} \)

Explanation:
1. It has five water molecules of crystallisation.

Teacher's Note:
1. Contains water in crystal.

Question 20: Dilute HCl does NOT react with
(a) Zn
(b) \( \ce{Na2CO3} \)
(c) NaOH
(d) Cu
Show Answer & Explanation

Answer: (d) Cu

Explanation:
1. Copper is below hydrogen in the reactivity series.

Teacher's Note:
1. Unreactive metal.

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Multiple Choice Questions (MCQs) for Class 10 Chemistry Acids, Bases and Salts

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FAQs

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