Waec Chemistry 1996 Past Questions and Answers

Question 6:

• WAEC 1996

''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of

A. Charles Law
B. Boyle's Law
C. Avogadro's Law
D. Graham's Law
E. Gay Lussac's Law

Question 7:

• WAEC 1996

What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO₃ reacts with excess acid according to the following equation? CaCO₃ + 2HCI → CaCI2 +H₂O + CO₂ [CaCO₃ = 100; molar volume of a gas at s.t.p = 22.4dm³]

A. 11.20dm³
B. 5.60dm³
C. 2.24dm³
D. 0.56dm³
E. 0.28dm³

Question 8:

• WAEC 1996

A solution of pH 7 is

A. Acidic
B. Neutral
C. Concentrated
D. Dilute
E. Saturated

Question 9:

• WAEC 1996

Which of the following equations represents a neutralization reaction?

A. CaCI₂ + 2HCI →CI₂ +CaCI ₂ + H₂O
B. Na₂O₂ + H₂SO₄ → Na₂SO₄ + H₂O₂
C. H₂SO₄ + KOH → KHSO₄ + H₂ O
D. 2Na + 2H₂O → 2NaOH + H₂
E. CuSO₄ + 2NaOH → Cu(OH)₂+ Na₂SO₄

Question 10:

• WAEC 1996

Amphoteric oxides are oxides which

A. React with water to form acids
B. React with water to form alkali
C. Show neither acid nor basic properties
D. React with acids alkalis
E. Contain high proportion of oxygen