Waec Chemistry 1989 Past Questions and Answers

Question 6:

• WAEC 1989

The earthly impurities in iron ore are removed in the blast furnace by the reaction

A. CO₂ + C →2CO
B. Fe₂O₃ + 3CO →2Fe + 3CO₂
C. SiO₂ + CaO →CaSiO₃
D. CaCO₃ → CaO + CO₂
E. C +CO₂ → CO₂

Question 7:

• WAEC 1989

Which of the following hydrocarbons is not likely to be present in petrol?

A. C₁₄H₃₀
B. C₁₀H₂₂
C. C₉H₂₀
D. C₇H₁₆
E. C₅H₁₂

Question 8:

• WAEC 1989

The most suitable method to use when separating an insoluble solid from a liquid is

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

Question 9:

• WAEC 1989

The following are miscible with water except

A. Ethylethanoate
B. Methanol
C. Ethanoic acid
D. Methanoic acid
E. Ethanol

Question 10:

• WAEC 1989

If 200cm ³ of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm³)

A. 300g
B. 200g
C. 150g
D. 30g
E. 15g