Acids Bases and Salts MCQs Concise Class-10 ICSE Chemistry Selina Solutions Chapter-3. We Provide Step by Step Answer of MCQs Questions of Exercise-3 for ICSE Class-10. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.

Acids Bases and Salts MCQs Concise Class-10 ICSE Chemistry Selina Solutions Chapter-3

Board	ICSE
Book / Publication	Concise / Selina
Subject	Chemistry
Class	10th
Writer	Dr SP Singh
Chapter-3	Acids Bases and Salts
Topics	MCQs
Edition	2025-2026

Imp MCQs on Acids Bases and Salts

Page-61

Que-1: The acid which contains four hydrogen atoms is :

(a) Formic acid
(b) Sulphuric acid
(c) Nitric acid
(d) Acetic acid

Ans: (d) Acetic acid

Que-2: A black coloured solid which on reaction with dilute sulphuric acid forms a blue coloured solution is :

(a) Carbon
(b) Manganese [IV] oxide
(c) Lead [II] oxide
(d) Copper [II] oxide

Ans: (d) Copper [II] oxide
Hint: Copper [II] oxide is black in colour and the following reaction takes place when it is treated with dilute sulphuric acid —
CuO + H₂SO₄ ⟶ CuSO₄ + H₂O
CuSO₄ is a blue coloured soln.

Que-3: A weak organic acid is :

(a) Formic acid
(b) Sulphuric acid
(c) Nitric acid
(d) Hydrochloric acid

Ans: (a) Formic acid
Hint: Formic acid (HCOOH) is a weak organic acid whereas Sulphuric acid (H₂SO₄), Nitric acid (HNO₃) and Hydrochloric acid (HCl) are strong mineral (or inorganic) acids.

Que-4: A complex salt is :

(a) Zinc sulphate
(b) Sodium hydrogen sulphate
(c) Iron [ammonium sulphate]
(d) Tetraammine copper [II] sulphate

Ans: (d) Tetraammine copper [II] sulphate
Hint: Tetraammine copper [II] sulphate ([Cu(NH₃)₄]SO₄) is a complex salt as on dissociation, it gives one simple ion and one complex ion:
[Cu(NH₃)₄]SO₄ ⟶ [Cu(NH₃)₄]²⁺ + SO₄^2-

Que-5: Which one of the following will not produce acid with water ?

(a) CO
(b) CO₂
(c) NO₂
(d) SO₃

Ans: (a) CO
Hint: Carbon monoxide reacts with water to form carbon dioxide and releases hydrogen gas. Hence, acid is not formed.
CO + H₂O ⟶ CO₂ + H₂

Que-6: The basicity of acetic acid is:

(a) 3
(b) 1
(c) 4
(d) 2

Ans: (b) 1
Hint: Acetic acid has four hydrogen atoms in it but it ionises in aqueous solution to produce one hydrogen ion per molecule of the acid. Hence, basicity of acetic acid is 1.

Que-7: Lead sulphate can be prepared by the following methods.

P Reacting lead with sulphuric acid.
Q Reacting lead nitrate with sodium sulphate solution.
R Reacting lead oxide with sodium sulphate solution.
(a) Only P
(b) Only Q
(c) Only R
(d) Both Q and R

Ans: (b) Only Q
Hint: Insoluble lead sulphate is prepared from insoluble lead carbonate or insoluble lead oxide by first converting them into soluble lead nitrate (with the help of dilute nitric acid).
PbCO₃ + 2HNO₃ → Pb(NO₃)₂ + CO₂ + H₂O
PbO + 2HNO₃ → Pb(NO₃)₂ + H₂O
The resulting solution is then treated with sodium sulphate solution to get lead sulphate as a white precipitate.
Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ ↓ + 2NaNO₃

Que-8:

Assertion (A): All acids form hydronium ions when dissolved in water.
Reason (R): Every acid has hydrogen as the necessary element.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Ans: (a) Both A and R are true and R is the correct explanation of A.
Hint: When dissolved in water, acids donate protons (H⁺), which associate with water molecules to form hydronium ions (H₃O⁺).
Acids are defined as compounds which contain one or more hydrogen atoms and when dissolved in water, produce hydronium ions (H₃O⁺) as the only positively charged ions. Hence both assertion (A) and reason (B) are true and (R) correctly explains (A).

Que-9:

Assertion (A): All bases react with acids to form salt and water only.
Reason (R): All alkalis are bases but all bases are not alkalis.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans: (b) Both A and R are true but R is not the correct explanation of A.
Hint: All bases react with acid to form salt and water. This reaction is called as neutralisation reaction. Hence the assertion (A) is true.

Que-10:

Assertion (A): Acids which contain carbon are necessarily organic acids.
Reason (R): All organic acids are derived from plants and animals.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans: (d) A is false but R is true.
Hint: Every acid that contains carbon is not an organic acid.
Example: Carbonic acid (H₂CO₃) contains carbon but is an inorganic acid. Hence the assertion (A) is false. Acids that are derived from plants and animals are all organic acids. Hence the reason (R) is true.

Que-11:

Assertion (A): Acids have a pH of more than 7.
Reason (R): Acids produce hydronium ions as the only positively charged ion in solution.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans: (d) A is false but R is true.
Hint: The pH of an acid is less than 7. Hence the assertion (A) is false. Reason (R) is true because, acids are defined as compounds which contain one or more hydrogen atoms and when dissolved in water, produces hydronium ion as the only positively charged ions.

Que-12:

Assertion (A): Iron (III) chloride is stored in a moisture proof container.
Reason (R): Iron (III) chloride is hygroscopic in nature.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans: (c) A is true but R is false.
Hint: Iron (III) chloride is highly deliquescent that means it is a substance, that absorbs moisture from the air and dissolves, becoming a liquid. So it is kept dry in a moisture proof container with the help of fused calcium chloride (drying agent). Hence given assertion (A) is true.
Reason (R) is false because iron (III) chloride being deliquescent, dissolves in water to form liquid solution whereas hygroscopic substances absorb moisture from the air, but do not dissolve in it.

Que-13:

Assertion (A): Water is added to acids to dilute them.
Reason (R): The addition of water to acids is a highly exothermic reaction. Splashes of acid solution may come in contact with skin and container may also break.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans: (d) A is false but R is true.
Hint: Acids are diluted by adding acid to water, not by adding water to acid. The goal is to reduce the concentration of hydrogen ions (H⁺) in solution safely. Hence the assertion (A) is false.
Reason is true because water is not added to acid as it is an exothermic process and in this process so much heat is produced that splashing of acidic solution may occur, also the container may break which can be fatal to the person.

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