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For a reaction at equilibrium A(g) B(g) + 2 1 C(g) the relation between dissociation constant (K), degree of dissociation ( α ) and equilibrium pressure (p) is given by :

1. K = ) – 1 ( 2 3 1 p 2 1 2 3 2 1 α ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ α + α
2. K = ( ) ) – 1 ( 2 p 2 1 2 1 2 3 α α + α
3. K = ) – 1 ( 2 3 1 ) p ( 2 1 2 3 α ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ α + α
4. K = 2 1 2 3 ) – 1 ( ) 1 ( ) p ( α α + α

Correct answer: K = ( ) ) – 1 ( 2 p 2 1 2 1 2 3 α α + α

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