Exercise 3

Question 16 :

Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be


A). 2 : 16 : 2
B). 2 : 16 : 1
C). 1 : 16 : 2
D). 1 : 1 : 1
Answer : Option C

Question 17 :

The mass number of an atom is equal to


A). the number of protons
B). the number of protons and electrons
C). the number of nucleons
D). the number of neutrons
Answer : Option C

Question 18 :

The maximum number of covalent formed by nitrogen is


A). 1
B). 2
C). 3
D). 4
Answer : Option D

Question 19 :

The formula C6H5-CO-CH3 represents


A). Acetone
B). Acetic acid
C). Acetophenone
D). Phenyl acetate
Answer : Option C

Question 20 :

The metal that is usually extracted from sea water is


A). Ca
B). Na
C). K
D). Mg
Answer : Option D