PG TRB Chemistry Study Materials 2020-2021 - 2

Question: 6

The chemical reaction in which one element replaces the other element is called

(A) Neutralisation

(B) Reduction

(C) Decomposition

(D) Displacement

Question: 7

Emission of radiant energy in an excited atom is caused by the movements of electron from the stationary state to another is

(A) higher energy

(B) lower energy

(C) no energy

(D) equal energy

Question: 8

Which of the following valency is not exhibited by sulphur?

(A) 2

(B) 3

(C) 5

(D) 6

Question: 9

Nucleus contains

(A) Protons and neutrons

(B) Protons

(C) Neutrons

(D) Electrons

Question: 10

The fixed ratio by weight in which hydrogen and oxygen are present in water is

(A) 1:2

(B) 1:8

(C) 2:1

(D) 2:8