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Question

At a certain temperature 2HIH2+I2 only 50% HI is dissociated at equilibrium. The equilibrium constant is :

A
0.25
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B
0.3
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C
0.5
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D
1
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Solution

The correct option is A 0.25
2HIH2+I2
2 0 0 Initial concentration
2-2x x x At equilibrium
Since only 50% of HI is dissociated, thus
2x=1=>x=0.5
Now, from expression for equilibrium constant for the reaction we get,
Kc=x222x=0.25

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