Chemistry 2012 | Study Mode

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Question 21
A
Crystalline from
B
melting point
C
reactivity with dilute acids
D
solubility in water
Explanation

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Correct option: D
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Question 22
A
-3
B
-1
C
1
D
3
Explanation

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Correct option: D
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Question 23
A
2NaO2(s)
B
NaOH(aq)
C
H2O(1)
D
O2(g)
Explanation

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Correct option: A
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Question 24
A
5.36 x 10 -4 mole
B
1. 87 x 10 10 -3 mole
C
9. 35 x 10 -4 mole
D
3. 73 x 10 -3
Explanation

Cu\(^{2+}\) + 2e\(^{-}\)\(_{(aq)}\) \(\rightarrow\) Cu\(_{(s)}\)

Liberating 1 mole of Cu

2 x 1F = 2 x 96,500C = 193,000C of electricity is needed

Hence, 193,000C = 1 mole

360C of electricity = \(\frac{360C \times 1 mol}{193,000C}\)

= 0.001865 mol

= 1.87 x 10\(^{-3}\) moles


Correct option: B
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Question 25
A
electrons flow from zinc to M
B
M is more electropositive than zinc
C
M is more electonegative than zinc
D
zinc is more electropositive than M
Explanation

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Correct option: B
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Question 26
A
+ 262 KJ mol -1
B
- 262 KJ mol -1
C
+ 42 KJ mol -1
D
- 42 KJ mol -1
Explanation

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Correct option: C
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Question 27
A
mixing of gases
B
freezing of water
C
the condensation of vapour
D
solidifying candle wax
Explanation

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Correct option: A
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Question 28
A
0.05 mol -3HCI and 5g powdered CaCO3
B
0.05 mol -3HCI and 5g lump CaCO3
C
0.10 mol -3HCI and 5g powdered CaCO3
D
0.025 mol -3HCI and 5g powdered CaCO3
Explanation

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Correct option: C
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Question 29
A
sulphur (VI) oxide
B
hydrogen chloride
C
sulphur (VI) oxide
D
hydrogen sulphide
Explanation

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Correct option: D
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Question 30
A
N2
B
N2O
C
CI2
D
NH3
Explanation

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Correct option: D

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