Polytechnic TRB Chemistry Model Question Paper with Answer Keys - 4

Question: 16

The only metal in the liquid state is

(A) Potassium

(B) Iodine

(C) Calcium

(D) Mercury

Ans: D

Mercury

Question: 17

An aqueous solution of washing soda is

(A) Alkaline in nature

(B) Acidic in nature

(C) Both acidic and basic

(D) Neutral

Ans: A

Alkaline in nature

Question: 18

A mixture of salt and sand can be separated by

(A) Dry distillation

(B) Gravity separation

(C) Sublimation

(D) Dissolving in water

Ans: D

Dissolving in water

Question: 19

The ingredient of some tooth paste is

(A) NaCl

(B) NaOH

(C) NH3

(D) CaCO3

Ans: D

CaCO3

Question: 20

Baking powder is a mixture of

(A) Sodium bicarbonate and tartaric acid

(B) Sodium carbonate and tartaric acid

(C) Sodium carbonate and common salt

(D) Sodium bicarbonate and common salt

Ans: A

Sodium bicarbonate and tartaric acid

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