alloys, carbon & its various forms, hydrogen & compounds, sulphur, nitrogen, halogen & inert gases - Category wise Question and Answer Practice Test with Solutions

Question : 11 [PCS (Pre) 2014]

Which gas is not in the gaseous cycle?

a) $O_2$

b) Carbon

c) $N_2$

d) $H_2$

Question : 12 [UP UDA/LDA (Pre) 2001]

Consider the following statements and select the correct answer from given codes below.

1. Water becomes harder due to the presence of Calcium Sulphate and it is not usable.
2. Diamond is harder than copper and iron.
3. Oxygen is the main component of air.
4. Nitrogen is used in the manufacture of vegetable ghee.

a) 2 and 4

b) 1 and 2

c) 3 and 4

d) 1 and 3

Question : 13 [PCS (Pre) 2005]

Large quantities of drinking water is prepared from impure water by

a) Decantation

b) Ion-exchange

c) Desalination

d) Distillation

Question : 14 [IAS (Pre) 1994]

Water is a good solvent of ionic salts because

a) It has no colour

b) It has a high specific heat

c) It has a high boiling point

d) It has a high dipole moment

Question : 15 [RAS/RTS (Pre) 2000]

By which process, Alum cleans the muddy water?

a) Dialysis

b) Coagulation

c) Absorption

d) Adsorption