$\mathrm{K}_{2} \mathrm{HgI}_{4}$ is $40 \%$ ionised in aqueous solution. The value of its van't Hoff factor…
$\mathrm{K}_{2} \mathrm{HgI}_{4}$ is $40 \%$ ionised in aqueous solution. The value of its van't Hoff factor (i) is:
- 1.6
- 1.8
- 20
- 22
Solution
$\mathrm{K}_{2} \mathrm{Hgl}_{4} \rightleftharpoons 2 \mathrm{~K}^{+}+\left[\mathrm{Hgl}_{4}\right]^{2-} ; \mathrm{n}=3$
$
\begin{aligned}
\because & \alpha=\frac{i-1}{n-1} ; 0.4=\frac{\mathrm{i}-1}{3-1} \\
& i=1.8
\end{aligned}
$
Asked in: JEE Main 2019 (11 Jan Shift 2)
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