QJEEM16Ch5687: JEE Main 2016 Chemistry - Class 12 JEEM16Ch5687 Solution: An aqueous solution of a salt MX 2 at certain temperature has a …

Question

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An aqueous solution of a salt MX₂ at certain temperature has a van’t Hoff factor of 2. The degree of dissociation for this solution of the salt is :

Accepted Answer

Let us assume that degree of dissociation is $\alpha$ .

$\begin{matrix} M X_{2} & \to M^{2 +} + & 2 X + \\ (1 - α) & α & 2 α \end{matrix}$

Thus, after dissociation total number of moles formed (n) = 3.

Now, we know degree of dissociation is

$\alpha = {{i - 1} \over {n - 1}} = {{2 - 1} \over {3 - 1}} = 0.50$

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