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Question:

In which one of the following equilibria, Kp ≠ Kc?

2NO(g)⇌N2(g)+O2(g)

NO2(g)+SO2(g)⇌NO(g)+SO3(g)

2C(s)+O2(g)⇌2CO(g)

2HI(g)⇌H2(g)+I2(g)

Solution:

Correct option is D. 2C(s)+O2(g)⇌2CO(g)
If Δng ≠ 0, Kp ≠ Kc
Here in all the equation, the number of moles of gaseous reactant and products are same except in the reaction in which formation of CO (Δn=2−1;=1) is taking place.