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  4. K2[.HgI4]. is 55 % ionised in aqueous solution. The value of Van't Hoff factor is

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Q. $K_{2}\left[\right.HgI_{4}\left]\right.$ is $55\%$ ionised in aqueous solution. The value of Van't Hoff factor is

NTA AbhyasNTA Abhyas 2022

Solution:

$K_{2}\left[HgI_{4}\right] \rightarrow 2K^{+}+HgI_{4}^{2 -}$
$\Rightarrow i=1+\left(n - 1\right)\alpha $
$\Rightarrow i=1+\left(3 -1\right)\times 0.55\left(\because n = 3\right)$
$\therefore \, i=2.1$