1992 - WAEC Chemistry Past Questions and Answers - page 4
31
Which of the following pH values is likely to be that of a slightly alkaline solution?
A
2
B
5
C
7
D
8
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32
Which of the following minerals contains flurine as one of its constituent elements?
A
Cryolite
B
Bauxite
C
Potash alum
D
Kaolin
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33
The product of the reaction between propanoic acid and ethanol is
A
prophlmethanoate
B
ethylethanoate
C
methylpropanoate
D
propylethanoate
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34
Which of the following groups contains entirely linear molecules?
A
H 2NH3O 2
B
CO2NH 3 2
C
H 2CH4N2
D
CO2H2N2
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35
What is the value of n in the following equation? XO-4 +8H + + ne- → X2 + + 4H2O
A
2
B
3
C
4
D
5
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36
A dye is suspected to have contaminated a lollipop. Which of the following is the best method by which the contaminant may be isolated?
A
Fractional distillational
B
Recrystallization
C
Filtration
D
Paper chromatography
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37
Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?
A
Electrons are present in metals but not in salt solutions
B
Metals are conductors while salts are electrolytes
C
Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution
D
salts ionize in aqueous solutions while metals do not
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