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Question

In which of the following equilibrium, Kc=Kp?
  1. 4NH3(g)+5O2(g)4NO(g)+6H2O(g)
  2. N2(g)+3H2(g)2NH3(g)
  3. N2(g)+O2(g)2NO(g)
  4. 2NO(g)+O2(g)2NO2(g)

A
2NO(g)+O2(g)2NO2(g)
B
N2(g)+O2(g)2NO(g)
C
4NH3(g)+5O2(g)4NO(g)+6H2O(g)
D
N2(g)+3H2(g)2NH3(g)
Solution
Verified by Toppr


Kp only counts with gases molecule , while Kc only counts with aqueous solution+ gases. So here reactant and product both are gaseous that's why only reaction having equal numbers of reactants and products will have kp=kc ie.change in number of moles is equal to 0.option(a) is correct.

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