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Question

The decomposition of N2O4 to NO2 is carried at 280K in chloroform. When equilirbrium has been established, 0.2 mole of N2O4 and 2×103 mole of NO2 are present in 2 litre solution. The equilibrium constant for the reaction,
N2O4(g)2NO2(g) is:

A
1×102
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B
2×103
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C
1×105
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D
2×105
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Solution

The correct option is B 1×105
The decomposition of N2O4 to NO2 is carried at 280K in chloroform. When equilibrium has been established, 0.2 mole of N2O4 and 2×103 mole of NO2 are present in 2 litre solution.
[N2O4]=0.2mol2L=0.1M
[NO2]=2×103mol2L=1×103M
Kc=[NO2]2[N2O4]
Kc=(1×103)20.1

Kc=1×105
The equilibrium constant for the reaction,

N2O4(g)2NO2(g) is 1×105

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