PG TRB Chemistry Study Materials 2020-2021 - 4

Question: 16

The hardest non metal is

(A) Diamond

(B) Sodium

(C) Sulphur

(D) Potassium

Question: 17

The radioactive noble gas is

(A) He

(B) Xe

(C) Rn

(D) Ne

Question: 18

The atomicity of Phosphorous is

(A) 1

(B) 2

(C) 3

(D) 4

Question: 19

The positively charged particles of atoms are

(A) Protons

(B) Electrons

(C) Nuclei

(D) Neutrons

Question: 20

The shape of crystal of rhombic sulphur is

(A) Trigonal

(B) Octahedral

(C) Square planar

(D) Tetrahedral