2001 - JAMB Chemistry Past Questions and Answers - page 5

41
The gas that can best be collected by downward displacement of air is
A
Chlorine
B
Sulphur (IV) oxide
C
Ammonia
D
Carbon (IV) oxide
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42
Which of the following metals burn with brick red flame?
A
Pb
B
Ca
C
Na
D
Mg
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43
Which of the following represent hybridization in ethyne?
A
Sp2
B
Sp2d
C
Sp3
D
Sp
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44
C12H22O11(s) + H2SO4(aq) 12C(s) + 11H2O(l) + H2SO4(aq)
In the reaction above, tetraoxosulphate (VI) acid function as
A
A dehydrate agent
B
An oxidizing agent
C
A reducing agent
D
A catalyst
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45
When sodium reacts with water, the resulting solution is
A
Weakly acidic
B
Neutral
C
Acidic
D
Alkaline
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46
Which of the following gases contains the least number of atoms at s.t.p?
A
1 mole of butane
B
3 mole of ozone
C
4 mole of chlorine
D
7 mole of argon
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47
Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?
A
125 oC
B
150oC
C
175oC
D
250oC
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48
Use the graph above to answer this question.How long does it take all the solid to melt?`
A
2.5 mins
B
6.0 mins
C
1.0 min
D
3.0 mins
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49
The diagram above represents the formation of
A
a metallic bond
B
an electrovalent bond
C
a covalent bond
D
a coordinate covalent bond
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50
Use the solubility curves below to answer questions. If 1 dm3 of a saturated solution of L at 600C is cooled to 250C, what amount in mole will separate out?
A
0.75
B
0.25
C
1.00
D
0.50
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