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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