Waec Chemistry Past Questions and Answers

Question 61:

• 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 62:

• 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 63:

• WAEC 1989

The following are miscible with water except

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

Question 64:

• 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

Question 65:

• WAEC 1989

How many carbon atoms are there in a benzene ring?

A. 4
B. 5
C. 6
D. 7
E. 8