PG TRB Chemistry Study Materials 2020-2021 - 5

Question: 21

Which of the following is not chalcogen?

(A) O

(B) Na

(C) S

(D) Se

Question: 22

The ratio of NaOH and CaO mixture in soda lime is

(A) 1:2

(B) 1:3

(C) 2:3

(D) 3:1

Question: 23

An example for liquid aerosol is

(A) Smoke

(B) Paint

(C) Mist

(D) Sopa lather

Question: 24

How many electron pairs are present around carbon in methane molecule?

(A) 2

(B) 3

(C) 4

(D) 5