1993 - WAEC Chemistry Past Questions and Answers - page 3
21
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
A
Addition of washing soda
B
Adding of soap
C
Treatment with carbon exchange resin
D
Filtration
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22
Examples of polymers include the following except
A
starch
B
nylon
C
wool
D
perspex
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23
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is
A
Y2O
B
YNO2
C
Y2O3
D
Y (NO2)2
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24
Which of the following compounds of tin is a strong reducing agent?
A
SnCI2
B
SnCI4
C
SnO2
D
SnH4
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25
In which of the following pairs are both substances deliquescent?
A
CaCI2 and H2SO4
B
NaOH and MgSO4 7H2O
C
CaCI2 and NaOH
D
CUO and NaCI
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26
Producer gas is a mixture of
A
oxygen and hydrogen
B
Hydrogen and nitrogen
C
nitrogen and oxygen
D
nitrogen and carbon (ll) oxide
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27
An alkene may be converted to an alkane by
A
halogenation
B
hydrolysis
C
dehydration
D
hydrogenation
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28
Which of the following gases are diatomic except
A
nitrogen
B
helium
C
hydrogen
D
fluorine
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29
Which of the following is correct about the electrons in the 1s orbital? They
A
have the same spin
B
are easier to remove than those in the 2p orbital
C
are closest to the nucleus
D
have the same energy as those in the 2s orbital
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30
The product of the reaction between ethanol and excess acidified K2Cr2O2 is
A
ethanal
B
ethylethanoate
C
ethanoic acid
D
ethyne
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