1998 - JAMB Chemistry Past Questions and Answers - page 3
21
2X(g) + Y(g) → Z(g): In the equation above, The rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is?
A
R = k (X)(Y)
B
R = K (X) ° (Y)
C
R = K (X) ° (Y) 2
D
R = K (X) 2(Y)°
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22
A gas that turns a filter paper previously soaked in lead ethanoate solution black is?
A
hyrogen chloride
B
hydrogen sulphide
C
sulphur (IV) oxide
D
sulphur (VI) oxide
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23
3CuO(s) + 2NH3(g) → 3Cu(s) + 3H2O(I) N2(g) (i).
2NH3(g) + 3Cl2(g) → 6HCl(g) + N2(g) (ii).
4NH3(g) + 3O2(g) → 6H2O(I) + 2N2(g) (iii).
The reactions represented by the equations above demonstrate the?
2NH3(g) + 3Cl2(g) → 6HCl(g) + N2(g) (ii).
4NH3(g) + 3O2(g) → 6H2O(I) + 2N2(g) (iii).
The reactions represented by the equations above demonstrate the?
A
basic properties of ammonia
B
acidic properties of ammonia
C
reducing properties of ammonia
D
oxidizing properties of ammonia
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24
A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute?
A
HNO 3 but soluble in ammonia solution
B
HNO3 and ammonia solution
C
HCl but soluble in ammonia solution
D
HCl and in ammonia solution
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25
The oxide that remains unchanged when heated in hydrogen is?
A
CuO
B
Fe2O3
C
PbO2
D
ZnO
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26
Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide?
A
A gas is evolved
B
A deep blue precipitate is formed
C
The resultant solution turns green turns
D
A brown precipitate is formed
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27
The metal that will react with water only in the form of steam to librate hydrogen gas is?
A
calcium
B
aluminium
C
iron
D
zinc
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28
A common characteristic shared by iron and aluminium is that both?
A
are extracted by reduction methods
B
form only basic oxides
C
show oxidation states of +2 and +3
D
form soluble hydroxides
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29
Alloys are often used in preference to pure metals because?
A
metals are too hard
B
merals are ductile
C
metallic properties are improve in alloys
D
alloys are a mixture of metals
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30
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an?
A
alkanone
B
alkane
C
alkene
D
alkyne
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