1994 - JAMB Chemistry Past Questions and Answers - page 3
21
Which of the following is the correct order of decreasing activity of the metals Fe, Ca, Al and Na?
A
Fe> Ca> Al> Na
B
Na> Ca> Al> Fe
C
Al> Fe> Na> Ca
D
Ca> Na> Fe>, Al
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22
Which of the following compounds is NOT an isomers of 2,2 dimethylbutane?
A
2-methylbutane
B
3-methylpentane
C
2,3-dimethylbutane
D
2-methylpentane
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23
When sodium is added to ethanol, the products are?
A
sodium hydroxide and water
B
sodium hydroxide and hydrogen
C
sodium ethoxide and water
D
sodium ethoxide and hydrogen
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24
The general formula of alkanoates is?
A
RCHO
B
R2CO
C
RCOOH
D
RCOOR
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25
One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?
A
an alkane
B
an alkene
C
an alkyne
D
aromatic (C = 12, H = 1)
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26
Which of the following reagents will confirm the presence of unsaturation in a compound?
A
Fehling's solution
B
Bromine water
C
Tollen's reagent
D
Benedict's solution
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27
A
magnesium
B
helium
C
chlorine
D
neon
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28
A
oxygen in air
B
water vapour in air
C
CO2 in air
D
arygen in air
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29
A
-100 kJ mol--1
B
+ 100 kJ mol-1
C
+50 kJ mol-1
D
-50 kJ mol-1
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30
A
y - x
B
x
C
x - z
D
y
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