set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one among the following does not have an allotrope?

a) Sulphur

b) Nitrogen

c) Oxygen

d) Carbon

Question : 2

Which of the following is a good conductors of heat and electricity?

a) Chlorine

b) Graphite

c) Oxygen

d) Nitrogen

Question : 3

Naturally occuring substances from which a metal can be profitably (or economically) extracted are called?

a) Gangue

b) Minerals

c) Ores

d) Salts

Question : 4

Yellow colour of usual nitric acid is due to the presence of which one of the following?

a) NO

b) N₂₅

c) N₂O

d) NO₂

Question : 5

Which is the most reactive metal?

a) Calcium

b) Iron

c) Sodium

d) Potassium

Question : 6

Which one of the following is the softest?

a) Aluminium

b) Iron

c) Sodium

d) Copper