Chemistry MCQ for Competitive Exams with Answers - 1

Question: 1

Washing soda is the common name of

(A) Sodium Carbonate

(B) Sodium Bi-Carbonate

(C) Calcium Carbonate

(D) Calcium Bi-Carbonate

Ans: A

Sodium Carbonate

Question: 2

Which of the following ores does not contain iron?

(A) Cassiterite

(B) Limonite

(C) Magnetite

(D) Haematite

Ans: A


Question: 3

Heavy water is so called because it

(A) is the mercury contaminated water

(B) contains the heavier isotope of hydrogen in water

(C) is saline water used in hospitals

(D) contains a number of salts as in sea water

Ans: B

contains the heavier isotope of hydrogen in water

Question: 4

The chemical used as a ‘fixer’ in photography is:

(A) Ammonium persulphate

(B) Sodium sulphate

(C) Sodium thiosulphate

(D) Borax

Ans: C

Sodium thiosulphate

Question: 5

The substance which decreases the rate of a chemical reaction is called

(A) Inhibitor

(B) Moderator

(C) Promoter

(D) Poison

Ans: D


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