PG TRB Chemistry Online Test - 4

Question: 16

When sodium chloride is treated with silver nitrate, which of the following is precipitated?

(A) Silver chloride

(B) Sodium

(C) Sodium nitrate

(D) Silver

Question: 17

Cinnabar is an ore of

(A) Hg

(B) Cu

(C) Pb

(D) Zn

Question: 18

Which one of the toxic gases in the environment lowers the resistance to pneumonia in human beings?

(A) Oxyegn

(B) Carbon dioxide

(C) Hydrogen chloride

(D) Nitrogen dioxide

Question: 19

The law of relative lowering of vapor pressure was given by

(A) Van’t Hoff

(B) Lewis

(C) Ostwald

(D) Raoult

Question: 20

Boiling point of nitrogen is

(A) -32°C

(B) -183°C

(C) -186°C

(D) -196°C