set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

a) Copper

b) Magnesium

c) Zinc

d) Iron

Question : 2

Chemically rust is

a) ferric oxide only

b) hydrated ferric oxide only

c) hydrated ferrous oxide only

d) ferrous oxide only

Question : 3

What are the elements which are liquids at room temperature and standard pressure?

1. Helium
2. Mercury
3. Chlorine
4. Bromine

a) 2, 3 and 4

b) 2 and 4

c) 2 and 3

d) 1 and 3

Question : 4

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 : 5

Which of the following non-metals sublimes on heating ?

a) Bromine

b) Fluorine

c) Chlorine

d) Iodine

Question : 6

Removal of impurities from ore is known as -

a) calcination

b) crushing and grinding

c) concentration of ore

d) roasting