Waec Chemistry 2001 Past Questions and Answers

Question 11:

• WAEC 2001

Which of the following pairs of reagents reat to produce hydrogen?

A. Zinc and concentrated trioxonitrate (V) acid
B. Water and calcium dicarbide
C. Copper and dilute hydrochloric acid
D. Magnesium and dilute tetraoxosulphate (VI) acid

Question 12:

• WAEC 2001

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

A. Evaporation
B. Sublimation
C. Distillation
D. Filtration

Question 13:

• WAEC 2001

Which of the following would dissolve in warm dilute H₂SO₄ without effervescence, to give a blue solution?

A. Copper turnings
B. Copper (ll) trioxocarbonate (IV)
C. Copper (ll) oxide
D. Copper alloy

Question 14:

• WAEC 2001

In which of the reactions represented by the following equations is HNO₃ behaving as a typical acid?

A. CaO + 2HNO₃ → Ca(NO₃) ₂ + H ₂O
B. Cu + 4HNO₃ → Cu(NO ₃)₂ + 2H₂O + 2NO₂
C. S + 6HNO₃ → H₂SO ₄ + 6NO₂ + 2H₂O
D. P + 5HNO₃ → H ₃PO ₄ + 5NO₂ + H₂O

Question 15:

• WAEC 2001

A gas was evolved when a sample of gastric juice reacted with sodium trioxocarbonate (IV) . The gas evolved was

A. NH₃
B. SO₂
C. HCI[sub][/sub]
D. CO₂