JEE Main, NEET MCQs Set 4

Sr. No.

Question

Answer

1.

A white crystalline salt A reacts with dilute HCI to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute H₂SO₄ to a green coloured solution C. A, B and C are respectively ______.

(A) Na₂S₂O₃, SO₂, Cr₂ (SO₄)₃

(B) Na₂SO₃, SO₂, Cr₂ (SO₄)₃

(C) Na₂SO₄, SO₂, Cr₂ (SO₄)₃

(D) Na₂S, SO, Cr₂ (SO₄)₃

Answer: (A)

2.

According to Bayer’s strain theory which is highly stable?

(A) cyclohexane

(B) cycloheptane

(C) cyclopentane

(D) cyclobutane

Answer: (C)

3.

Acidified K₂Cr₂O₇ solution turns green when Na₂SO₃ is added to it. This is due to the formation of

(A) CrSO₄

(B) Cr₂(SO₄)₃

(C)

(D) Cr₂(SO₃)₃

Answer: (B)

4.

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of

(A) S

(B) N

(C) N and S

(D) S and Cl

Answer: (C)

5.

Amines behave as

(A) Lewis acids

(B) Lewis base

(C) aprotic acid

(D) neutral compound

Answer: (B)

6.

Among the following, the compound that contains ionic, covalent and coordinate linkage is

(A) NaCl

(B) CaO

(C) NH₃

(D) NH₄Cl

Answer: (D)

7.

Among the following, which is least acidic?

(A) phenol

(B) O-cresol

(C) p-nitrophenol

(D) p-chlorophenol

Answer: (B)

8.

An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be

(A) a primary amine

(B) a secondary amine-

(C) a tertiary amine

(D) a mixture of all the three

Answer: (D)

9.

An aqueous solution containing 6.5 gm of NaCl of 90% purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is

(A) 100 cm³

(B) 200 cm³

(C) 1000 cm³

(D) 2000 cm³

Answer: (A)

10.

An element with atomic number 21 is a

(A) halogen

(B) representative element

(C) transition element

(D) alkali metal

Answer: (C)

11.

The sp³d² hybridization of central atom of a molecule would lead to
(A) square planar geometry
(B) Tetrahedral geometry
(C) Trigonal bipyramidal geometry
(D) Octahedral geometry

Answer: (D)

12.

The reagent with which both acetaldehyde and acetone react is
(A) I₂/NaOH
(B) Fehling’s reaction
(C) Carbonic acid
(D) Tollen’s reagent

Answer: (A)

13.

The ozone layer forms naturally by
(A) the interaction of CFC with oxygen
(B) the interaction of UV radiation with oxygen
(C) the interaction of IR radiation with oxygen
(D) the interaction of oxygen and water vapour

Answer: (B)

14.

The number of naturally occurring p-block elements that are diamagnetic is ______.
(A) 6
(B) 18
(C) 7
(D) 5

Answer: (D)

15.

The normality of 30 volume H₂O₂ is
(A) 2.678 N
(B) 5.336 N
(C) 8.034 N
(D) 6.685 N

Answer: (B)