classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

Question : 11 [IAS Prelim]

Most of the explosions in mines occur due to the mixing of

a) oxygen with acetylene

b) methane with air

c) hydrogen with oxygen

d) carbon dioxide with ethane

Question : 12

The number of elements in the third period of periodic table is

a) 8

b) 18

c) 2

d) 32

Question : 13

Which of the following is an actinide?

a) Polonium

b) Promethium

c) Plutonium

d) Palladium

Question : 14

Consider the following statements :

1. 22gm. of $CO_2$ consist of 1 mole.
2. Number of molecules in 4 gm of oxygen is $10^22$.
3. Mass of 1 mole of a substance is called its formula mass.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 15 [MPPCS (Pre) 2016]

Pasteurization is related to

a) Dehydration of milk

b) Fermentation of milk

c) Sterilization of milk

d) Distillation of milk