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

Question : 16 [IAS (Pre) 1993]

Which type of colloidal system is expressed in the fog?

a) Gas in a liquid

b) Solid in a gas

c) Liquid in a gas

d) Liquid in liquid

Question : 17 [NDA]

Consider the following equation for the formation of ammonia from nitrogen and hydrogen:
N₂ + 3H₂ = 2NH₃
How many hydrogen molecules are required to react with 100 molecules of nitrogen?

a) 200

b) 300

c) 100

d) 400

Question : 18

The metal which is hard and has high m.p. and used in electric bulbs is

a) Pt

b) Fe

c) Ni

d) W

Question : 19

Match List-I with List-II:

a) A – (2), B – (3), C – (4), D – (1), E – (5)

b) A – (3), B – (2), C – (1), D – (4), E – (5)

c) A – (2), B – (3), C – (1), D – (4), E – (5)

d) A – (2), B – (3), C – (1), D – (5), E – (4)

Question : 20

All the members in a group in long form of periodic table have the same

a) number of valence electrons

b) chemical properties

c) valence

d) All of these