1989 - WAEC Chemistry Past Questions and Answers - page 1
1
The major raw material in a plastic industry is
A
ethanol
B
sulphur
C
methylethanoate
D
ethene
correct option: d
Users' Answers & Comments2
Which of the following reactions represents the laboratory preparation of hydrogen?
A
C(s) + H 2 O(l) → CO(g) + H2(g)
B
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
C
Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
D
Cu(s) + H2O(l) → CuO(s) + H2(g)
correct option: c
Users' Answers & Comments3
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
correct option: b
Users' Answers & Comments4
120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g)
A
30cm3
B
60cm3
C
90cm3
D
120cm3
correct option: d
Users' Answers & Comments5
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
correct option: c
Users' Answers & Comments6
Which of the following hydrocarbons is not likely to be present in petrol?
A
C14H30
B
C10H22
C
C9H20
D
C7H16
correct option: a
Users' Answers & Comments7
The most suitable method to use when separating an insoluble solid from a liquid is
A
evaporation
B
filtration
C
magnetization
D
sublimation
correct option: b
Users' Answers & Comments8
The following are miscible with water except
A
ethylethanoate
B
methanol
C
ethanoic acid
D
methanoic acid
correct option: a
Users' Answers & Comments9
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
correct option: d
Users' Answers & Comments10
How many carbon atoms are there in a benzene ring?
A
4
B
5
C
6
D
7
correct option: c
Users' Answers & Comments