TRB Polytechnic Model Question Paper for Chemistry - 1

Question: 1

The fluoride ore of aluminium is

(A) Cryolite

(B) Bauxite

(C) Corundum

(D) Haematite

Question: 2

Hydrogen sulphide gas has

(A) Rotten egg smell

(B) Pungent smell

(C) Fruity smell

(D) Smell

Question: 3

Which of the following has valency three?

(A) Carbonate ion

(B) Chloride ion

(C) Nitrate ion

(D) Phosphate ion

Question: 4

Which of the following is used in the commercial vulcanization of the rubber?

(A) Phosphorus

(B) Sulphur

(C) Selenium

(D) Sulphur

Question: 5

The number of electrons present in the valence shell of nitrogen atom is

(A) 2

(B) 3

(C) 4

(D) 5