PG TRB Chemistry Online Test - 3

Question: 11

In isotopes the number of neutrons are

(A) different

(B) same

(C) both

(D) none of these

Question: 12

Which of the following metals react with nitrogen at room temperature to form nitride?

(A) Sodium

(B) Magnesium

(C) Potassium

(D) None of these

Question: 13

Which one of the following forms of carbon is used in sugar industry

(A) Graphite

(B) Animal charcoal

(C) Lamp black

(D) Wood charcoal

Question: 14

Chief constituent of water glass is

(A) Magnesium silicate

(B) Sodium silicate

(C) Acid

(D) Calcium silicate

Question: 15

The substance that are composed of two or more different elements in fixed proportion by mass are called

(A) Mixture

(B) Compound

(C) Element

(D) None of these