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Question

In which of the following reactions the equilibrium constant will have no units?


A
NO(g)12N2(g)+12O2(g)
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B
H2(g)+l2(g)2HI(g)
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C
CO(g)+H2O(g)CO2(g)+H2(g)
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D
In all the above reactions
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Solution

The correct option is B In all the above reactions
For a general reaction,
aA+bBcC+dD
Equilibrium constant is written as:
Kc=[C]c[D]d[A]a[B]b
so, whenever total moles of reactants and that of products are same i.e. (Δng=0) Kc will not have units which here hold true for all the reactions (since all the species are in gaseous phase only).

Chemistry

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