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Question

ReactionK
12N2(g)+O2(g)NO2K1
2NO2(g)N2O4(g)K2
Using the above equations, write down expression for K of the following reaction:
N2O4(g)N2(g)+12O2(g)

A
K1K2
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B
K22K1
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C
1K2K21
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D
1K21K2
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Solution

The correct option is C 1K21K2
12N2(g)+O2(g)NO2 K1 .....(1)
2NO2(g)N2O4(g) K2 .....(2)
Multiply equation (1) with 2.
N2(g)+2O2(g)2NO2 K3=K21 .....(3)
Reverse equation (3)
2NO2N2(g)+2O2(g) K4=1K3=1K21 .....(4)
Subtract equation (2) from equation (4)
N2O4(g)N2(g)+12O2(g)
K=K4K2=1K21K2

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