Question

$K_2[Hg{I}_4]$ is $55\%$ ionised in aqueous solution. The value of Van't Hoff factor is

• A. $2.1$
• B. $4.3$
• C. $1.9$
• D. $3.7$

Answer 1

Answer: (A)

$K_2\left[Hg{I}_4\right]\to 2K^{+}+Hg{I}_4^{2-}$
$\Rightarrow i=1+\left(n-1\right)\alpha$
$\Rightarrow i=1+\left(3-1\right)\times 0.55\left(\because n=3\right)$
$\therefore i=2.1$