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In which of the following equilibrium Kc and Kp are not equal?

1. 2 NO(g) ⇌ N2(g) + O2(g)
2. SO2(g) + NO2(g) ⇌ SO3(g) + NO(g)
3. H2(g) + I2(g) ⇌ 2HI(g)
4. 2C(s) + O2(g) ⇌ 2CO(g)

Correct answer: 2 NO(g) ⇌ N2(g) + O2(g)

Solution

Kc and Kp are not equal when the number of moles of gaseous reactants and products differ (Δn ≠ 0). For the reaction 2 NO(g) ⇌ N2(g) + O2(g), Δn = -1, so Kc ≠ Kp.

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