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Equilibrium Constant and Standard Free Energy Change

Which of the ...

Question

Which of the following equilibriums degree of dissociation is independent of initial concentration?

H I ⇌ \frac{1}{2} H_{2} + \frac{1}{2} I_{2}

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P C l_{5} ⇌ P C l_{3} + C l_{2}

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N_{2} O_{4} ⇌ 2 N O_{2}

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all the above

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Solution

The correct option is A $H I ⇌ \frac{1}{2} H_{2} + \frac{1}{2} I_{2}$
Dissociation reactions in which $Δ n = 0$ , degree of dissociation is independent of inital concentration.
For the equilibirum , equilibirum constant expression can written as,
$H I ⇌ \frac{1}{2} H_{2} + \frac{1}{2} I_{2}$
$K = \frac{C α}{C (1 - α)} = \frac{α}{1 - α}$

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