Waec Chemistry 1989 Past Questions and Answers

Question 1:

• WAEC 1989

The major raw material in a plastic industry is

A. Ethanol
B. Sulphur
C. Methylethanoate
D. Ethene
E. Ethane

Question 2:

• WAEC 1989

The major raw material in a plastic industry is

A. Ethanol
B. Sulphur
C. Methylethanoate
D. Ethene
E. Ethane

Question 3:

• WAEC 1989

Which of the following reactions represents the laboratory preparation of hydrogen?

A. C_(s) + H ₂ O_(l) → CO_(g) + H_2(g)
B. 2Na_(s) + 2H₂O_(l) → 2NaOH_(aq) + H_2(g)
C. Zn_{(s) + 2HCI[sub](aq)} → ZnCI_2(aq) + H_2(g)[/sub]
D. Cu_(s) + H₂O_(l) → CuO_(s) + H_2(g)
E. 2AI_(s) + 3H₂O_{(l) → Al[sub]2}O_3(s) + 3H_2(g)[/sub]

Question 4:

• WAEC 1989

Which of the following statements best explains cracking ? It is a process

A. In which an alkene adds on itself repeatedly to form long chain polymers
B. In which large hydrocarbon molecules are broken into smaller units
C. For measuring theoctane number of petrol
D. In which carbon chain results in a zigzag arrangement
E. In which aromatic hydrocarbons are produced

Question 5:

• WAEC 1989

120cm³ of hydrogen were sparked with 60cm ³ of oxygen at 110^oC. What was the volume of stream produced? The equation for the reaction is 2H_2(g) + O_2(g) → 2H₂O_(g)

A. 30cm₃
B. 60cm₃
C. 90cm₃
D. 120cm₃
E. 180cm₃