1997 - JAMB Chemistry Past Questions and Answers - page 4
31
The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?
A
hydrolysis of the iron
B
reaction of acid with base
C
oxidationof the rust
D
dehydration of the iron
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32
Which of the additives could improve the quality of steel?
A
Silicon
B
Sulphur and phosphorus
C
Carbon
D
Chromium and nickel
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33
Sodium hydroxide is prepared commercially from sodium chloride solution by?
A
electrolysis using mercury as cathode
B
hydrolysis in steam using a catalyst
C
electrolysis using iron as anode
D
treating sodium chloride with ammonia and carbon (IV) oxide
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34
A sample of a substance containing only C and H burns in excess O2 to yield 4.4g of CO2
and 2.7 g of H2O. The empirical formula of a substance is?
(C = 12, O = 16, H = 1)
and 2.7 g of H2O. The empirical formula of a substance is?
(C = 12, O = 16, H = 1)
A
CH3
B
CH2
C
CH4
D
C2H24
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35
An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?
A
iso-octane
B
n-heptane
C
iso-heptane
D
n-octane
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36
The reaction of an alkanol with an alkanoic acid in the presence of concentrated H2SO4 will produce an?
A
alkanal
B
alkanoate
C
alkanone
D
alkyne
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37
The final product of the reaction of ethyne with hydrogen iodine is?
A
CH3—CHI2
B
CH2l—CH2I
C
CH3—CI3
D
CH2 = CHI
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38
Synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called?
A
teflon
B
isoprene
C
polythene
D
neoprene
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39
The synthetic detergents are preferred to soap for laundry using hard water because?
A
detergents are water soluble while soap is not
B
the calcium salts of detergents are water soluble
C
the magnesium salt of soap is soluble in hard water
D
soap does not have a hydrocarbon terminal chain
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40
25 cm3 of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula CnH2n + 1 COOH. The molecular formula of the acid is?
(C = 12, H = 1, O = 16)
(C = 12, H = 1, O = 16)
A
HCOOH
B
C2H5COOH
C
CH3COOH
D
C3H7COOH
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