Waec Chemistry 1991 Past Questions and Answers

Question 1:

• WAEC 1991

The metal extracted from cassiterite is

A. Calcium
B. Copper
C. Tin
D. Sodium
E. Lead

Question 2:

• WAEC 1991

The metal extracted from cassiterite is

A. Calcium
B. Copper
C. Tin
D. Sodium
E. Lead

Question 3:

• WAEC 1991

In which of the following is the oxidation number of nitrogen zero?

A. SO₂ and NH₃
B. NaNO₃
C. HNO₂
D. NOI₃
E. N₂

Question 4:

• WAEC 1991

The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their

A. Physical states
B. Melting points
C. Rf. values
D. Solubility
E. Boiling points

Question 5:

• WAEC 1991

When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is

A. Carbon (IV) oxide
B. Nitrogen
C. Oxygen
D. Water vapour
E. Noble gases