Top 500+ TRB Chemistry Model Question Paper with Answers - 2

Question: 6

The ammonium compound, which is used as a “smelling salt” is

(A) Ammonium carbonate

(B) Ammonium nitrate

(C) Ammonium sulphate

(D) Ammonium chloride

Question: 7

Which gas is responsible for the swelling of bread?

(A) Oxygen

(B) Carbon monoxide

(C) Ammonia

(D) Carbon dioxide

Question: 8

Which of the following chemicals is used in foam fire extinguishers?

(A) Nickel sulphate

(B) Cobalt sulphate

(C) Copper sulphate

(D) Aluminum sulphate

Question: 9

The purest form of iron is

(A) steel

(B) pig iron

(C) cast iron

(D) wrought iron

Question: 10

Which of the following is used as a preservative to protect processed food?

(A) BHT

(B) Sodium metabisulphite

(C) Saccharin

(D) Sodium sulphate