set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Chemically rust is

a) ferric oxide only

b) hydrated ferric oxide only

c) hydrated ferrous oxide only

d) ferrous oxide only

Question : 2

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 : 3

Which one of the following statements is correct?

a) Calcium carbonate is an ingredient of toothpaste

b) Bordeaux mixture consists of sodium sulphate and lime

c) Liquid sodium is employed as a coolant in nuclear reactors

d) Zinc amalgams are used as a dental filling

Question : 4

The metal used to built bridges is

a) platinum

b) gold

c) silver

d) iron

Question : 5

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 : 6

Which of the following non-metals sublimes on heating ?

a) Bromine

b) Fluorine

c) Chlorine

d) Iodine