2014 - JAMB Chemistry Past Questions and Answers - page 3
21
Zn (s) + CuSO 4(aq) → ZnSO 4(aq) + Cu (s)
In the reaction above, the oxidation number of the reducing agent changes from
In the reaction above, the oxidation number of the reducing agent changes from
A
0 to + 4
B
0 to + 2
C
+ 1 to + 2
D
+ 1 to + 3
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22
H 2O (g) + C (s) → H2(g) + CO(g)
The oxidizing agent in the reaction above is
The oxidizing agent in the reaction above is
A
CO(g)
B
C(s)
C
H2O(g)
D
H(2)(g)
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23
Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound
[Cu=64, F = 96500 Cmol-1]
[Cu=64, F = 96500 Cmol-1]
A
32395.5
B
30156.3
C
60784.5
D
15196.5
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24
How many faraday of electricity is required to produce 0.25 mole of copper?
A
1.00F
B
0.01F
C
0.05F
D
0.50F
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25
If the change in free energy of a system is -899 Jmol-1 and the entropy change is 10Jmol-1k-1 at 250C, calculate the enthalpy change.
A
+2081 Jmol-1
B
-2081 Jmol-1
C
-649 Jmol-1
D
+649 Jmol-1
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26
In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?
A
Equilibrium constant is very large
B
∆H - T∆S = O
C
∆ H > T ∆ S
D
Equilibrium constant is less than zero
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27
In a chemical reaction, the change in concentration of a reactant with time is
A
entropy of reaction
B
enthalpy of reaction
C
rate of reaction
D
order of reaction
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28
Cr 2O\(\frac{2 -}{7}\) (aq) + H 2O(1)⇌ 2CrO \(\frac{2 -}{4}\) (aq) + 2H + (aq)
What happens to the reaction above when the hydrogen ion concentration is increased?
What happens to the reaction above when the hydrogen ion concentration is increased?
A
more of the products will be formed
B
the reaction will not proceed
C
the equilibrium position will shift to the right
D
the equilibrium position will shift to the left.
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29
Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid?
A
Lead
B
Magnesium
C
Cpper
D
Gold
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30
The gas that is removed by the water in the flask is
A
O 2
B
SO 2
C
HCI
D
H 2
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