set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

The most commonly used substance in fluorescent tubes are

a) Sodium Vapour and Neon

b) Mercury Vapour and Argon

c) Sodium Oxide and Argon

d) Mercuric Oxide and Neon

Question : 3

Which one among the following does not have an allotrope?

a) Sulphur

b) Nitrogen

c) Oxygen

d) Carbon

Question : 4

Which one of the following is the softest?

a) Aluminium

b) Iron

c) Sodium

d) Copper

Question : 5

The only metal that is liquid at room temperature is -

a) zinc

b) mercury

c) sodium

d) tungsten

Question : 6

Iron is obtained from

a) Pitch-blende

b) Monazite Sand

c) Limestone

d) Hematite