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In which one of the following equilibria, K p ≠ K C ?

1. 2NO(g) N 2 (g) + O 2 (g)
2. 2C(s) + O 2 (g) 2CO(g)
3. 2HI(g) H 2 (g) + I 2 (g)
4. NO 2 (g) + SO 2 (g) NO(g) + SO 3 (g)

Correct answer: 2C(s) + O 2 (g) 2CO(g)

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