Question

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

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

Solution

## The correct option is B In all the above reactionsFor a general reaction, aA+bB→cC+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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