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Question

For the reaction4NH3(g)+5O2(g)4NO(g)+6H2O(g),, the expression of Kc will be:

A
Kc=[NO]4[H2O]6[NH3]4[O2]5
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B
Kc=[NH3]4[O2]5[NO]4[H2O]6
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C
Kc=[NH3][O2][NO][H2O]
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D
Kc=[NO][H2O][NH3][O2]
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Solution

The correct option is A Kc=[NO]4[H2O]6[NH3]4[O2]5
4NH3(g)+5O2(g)4NO(g)+6H2O(g),
The reaction is an example of homogenous reaction
As per the law of mass action, rate of a reaction is proportional to the product of active masses of reactants and products raised to the powers of their stoichiometric coefficients.
So, Kc=[NO]4[H2O]6[NH3]4[O2]5

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