set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The process to heat the ore in the presence of excess supply of air below its melting point is called

a) smelting

b) roasting

c) calcination

d) liquation

Question : 2

The metal used to built bridges is

a) platinum

b) gold

c) silver

d) iron

Question : 3

Which one of the following elements cannot displace hydrogen gas from a dilute acid?

a) Copper

b) Magnesium

c) Zinc

d) Iron

Question : 4

Removal of impurities from ore is known as -

a) calcination

b) crushing and grinding

c) concentration of ore

d) roasting

Question : 5

Which one of the following is the correct order in which the gases H₂, Ne, O₂ and N₂ are evolved on fractional distillation of liquid air?

a) H₂, Ne, N₂, O₂

b) N₂, O₂, Ne, H₂

c) H₂, Ne, O₂, N₂

d) O₂, N₂, H₂, Ne

Question : 6

The chief ore of aluminium is

a) alunite

b) bauxite

c) cryolite

d) feldspar