Acid and Base MCQ Questions for CSIR NET & GATE Chemistry

This article contains a quiz with 10 MCQs from Chemistry chapter "Acid & Base".

• Total Marks = 40
• Correct Answer = +4 Marks
• Incorrect Answer = -1 Marks

Mathematical Physics Practice Test 1

Question 1. [NET June 2012]

In the reactions (A) and (B),

(A) nH₂O+Cl^- → [Cl(H₂O)_n]^-

(B) 6H₂O + Mg²⁺ → [Mg(H₂O)₆]²⁺

water behaves as

(a) An acid in both A and B

(b) An acid in A and base in B

(c) A base in A and acid in B

(d) A base in both A and B

a

b

c

d

Question 2. [NET June 2012]

In the following reactions carried out in liquid NH3

Zn(NH₂)₂ + 2 KNH₂ → K₂[Zn(NH₂)₄]

K₂[Zn(NH₂)₄] + 2NH₄NO₃ → Zn(NH₂)₂ + 2KNO₃ + 4NH₃

KNH₂ and NH₄NO₃ act respectively as

(a) Solvo-acid and solvo-base

(b) Solvo-base and solvo-acid

(c) Conjugate acid and conjugate base

(d) Conjugate base and conjugate acid

a

b

c

d

Question 3. [NET June 2012]

The least basic among the following is

(a) Al(OH)₃

(b) La(OH)₃

(c) Ce(OH)₃

(d) Lu(OH)₃

a

b

c

d

Question 4. [NET Dec 2012]

Match each item from the List-I (compound in solvent) with that from the List-II (its behavior) and select the correct combination using the codes given below

List-I	List-II
A. CH3COOH in pyridine	(i) strong acid
B. CH3COOH in H2SO4	(ii) weak acid
C. HClO4 in H2SO4	(iii) strong base
D. SbF5 in HF	(iv) weak base

(a) A-i, B-ii, C-iii, D-iv

(b) A-ii, B-i, C-iii, D-iv

(c) A-iii, B-iv, C-ii, D-i

(d) A-iv, B-ii, C-iii, D-i

a

b

c

d

Question 5. [NET June 2013]

The compound that will behave as an acid in H₂SO₄ is

(a) CH₃COOH

(b) HNO₃

(c) HClO₄

(d) H₂O

a

b

c

d

Question 6. [NET Dec 2014]

The reaction between SbF5 and two equivalents of HF leads to the formation of

(a) H₂SbF₃ + 2F₂

(b) HSbF₂ + 3 F₂

(c) SbF₃ + H₂ + 2 F₂

(d) [SbF₆]^-[H₂F]⁺

a

b

c

d

Question 7. [NET Dec 2014]

10 ml of 0.02 M NaOH is added to 10 ml of 0.02 M acetic acid (pKa=4.75). The pH of the solution will be closest to

(a) 7.0

(b) 8.4

(c) 5.6

(d) 9.6

a

b

c

d

Question 8. [NET June 2015]

Match the action of H₂O₂ in aqueous medium given in column A with the oxidation/reduction listed in column B

Action of H2O2	Type of reaction
I Oxidation in acid	A [Fe(CN)6]3- → [Fe(CN)6]4-
II Oxidation in base	B [Fe(CN)6]4- → [Fe(CN)6]3-
III Reduction in acid	C MnO4- → Mn2+
IV Reduction in base	D Mn2+ → Mn4+

The correct answer is

(a) I-A, II-B, III-C, IV-D

(b) I-B, II-D, III-C, IV-A

(c) I-C, II-D, III-B, IV-A

(d) I-D, II-A, III-C, IV-B

a

b

c

d

Question 9. [NET June 2015]

Water plays different roles in the following reactions

(i) 2H₂O + Ca → Ca²⁺ + 2OH^- + H₂

(ii) nH₂O + Cl → [Cl(H₂O)_n]^-

(iii) 6 H₂O + Mg²⁺ → [Mg(H₂O)6]²⁺

(iv) 2H₂O + 2F₂ → 4HF + O₂

The correct role of water in each reaction is,

(a) (i) oxidant, (ii) acid, (iii) base, (iv) reductant

(b) (i) oxidant, (ii)base, (iii)acid, (iv) reductant

(c) (i) acid, (ii) oxidant, (iii) reductant, (iv)

(d) (i) base, (ii)reductant, (iii) oxidant, (iv) acid

a

b

c

d

Question 10. [NET Dec 2015]

The order of increasing Bronsted acidity for boron hydrides is

(a) B₅H₉ < B₆H₁₀ < B₁₀H₁₄

(b) B₁₀H₁₄ < B₅H₉ < B₆H₁₀

(c) B₆H₁₀ < B₁₀H₁₄ < B₅H₉

(d) B₁₀H₁₄ < B₆H₁₀ < B₅H₉

a

b

c

d

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Answer Key

1. (b), 2. (b), 3. (a), 4. (c), 5. (c), 6. (d), 7. (b), 8. (b), 9. (a), 10. (a)

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