Waec Chemistry Past Questions and Answers

Question 31:

• WAEC 1988

Water gas is a mixture of

A. CO_{2 and H[sub]2}[/sub]
B. CO and H₂O
C. CO₂ and CO
D. CO and N₂
E. CO and H₂

Question 32:

• WAEC 1988

Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?

A. Cu
B. Zn
C. Al
D. Pb
E. Fe

Question 33:

• WAEC 1988

Which of the following is not a naturally occurring iron ore?

A. FeCl₂
B. Fe₂O₃O₃
C. Fe₂O₃
D. FeCO₃
E. FeS₂

Question 34:

• WAEC 1988

Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?

A. 2KOH+CI₂ → KCIO + KCI + H₂O
B. 4KOH + 2CI → 4KCI + 2H₂O + O₂
C. 6KOH + 3CI₂ → KCIO₃ + 5KCI + 3H₂O
D. 2KOH + CI₂ → 2KCI + H₂O₂
E. KOH + 2CI₂ + H₂O → KCI + 3HCI + O₂

Question 35:

• WAEC 1988

Aqueous sodium trioxocarbonate (IV) solution is alkaline because

A. Acid from which it is formed is strong
B. Sodium is an alkali metal
C. Sodium trioxocarbonate (IV) is decomposed by water
D. Sodium trioxocarbonate (lV) is stable to heat
E. Sodium triocarbonate (IV) is hydrolysed in water