PG TRB Chemistry Model Question Paper with Answer - 3

Question: 11

Manganese steel is used in making

(A) Electromagnets

(B) Razor blades

(C) Burglar proof safety lockers

(D) Surgical instrument

Ans: C

Burglar proof safety lockers

Question: 12

Oils are purified by

(A) Fractional distillation

(B) Steam distillation

(C) Vacuum distillation

(D) Crystallization

Ans: B

Steam distillation

Question: 13

In chemical terms, what are alums used for purifying water for drinking purposes?

(A) Hydrated chlorides

(B) Double nitrate

(C) Nitrates of aluminium

(D) Double sulphates

Ans: D

Double sulphates

Question: 14

What is iodized table salt?

(A) a heterogeneous mixture

(B) a homogeneous mixture

(C) a compound

(D) an element

Ans: B

a homogeneous mixture

Question: 15

Mark the halogen that does not give disproportionation reaction with alkalies

(A) Iodine

(B) Fluorine

(C) Bromine

(D) Chlorine

Ans: B

Fluorine

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