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At temperature T, compound AB 2(g) dissociates as AB 2(g) AB (g) + ) g ( 2 B 2 1 having degree of dissociation x (small compared to unity). The correct expression for x in terms of K p and p is

1. 3 p p K 2
2. 4 p p K 2
3. 3 2 p p K 2
4. p K

Correct answer: 3 2 p p K 2

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