Chemistry 2012 Waec Past Questions and Answers

Question 21 :

• WAEC 2012

A metal M forms two types of chlorine, MCl\(_2\) and MCl\(_3\) which of the following laws best explains the relationship between the chlorides? Law of

A. Conservation of mass
B. Definite proportion
C. Multiple proportion
D. Reciprocal proportion

Question 22 :

• WAEC 2012

Which of the following metals would readily displace hydrogen from steam?

A. Copper
B. Lead
C. Magnesium
D. Silver

Question 23 :

• WAEC 2012

The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [H = 1. 00; Molar volume at s.t.p. = 22.4 dm3]

A. 2.24 dm³
B. 4.48dm³
C. 22.4dm³
D. 44.8dm ³

Question 24 :

• WAEC 2012

When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to

A. Condense
B. Evaporate
C. Sublime
D. Precipitate

Question 25 :

• WAEC 2012

At ordinary temperature H\(_2\)O is a liquid while H\(_2\)S is a gas. This is because H\(_2\)O has

A. Weak intermolecular forces holding its molecules together
B. Strong hydrogen bonds holding its molecules together
C. Induced dipole-induced dipole forces between its molecules
D. Ionic force between its molecules