Question

$K_{2}Hg{I}_4$ is $40\%$ ionised in aqueous solution. The value of its van't Hoff factor (i) is:

• A. $1.8$
• B. $2.2$
• C. $2.0$
• D. $1.6$

Answer 1

The correct option is A $1.8$

$K_{2}Hg{I}_4\to 2K^{+}+{Hg{I}_4}^{2-}$

$i=1+(n-1)\alpha$

$\alpha =0.4$

$n=3$

$i=1+2\times 0.4=1.8$

Hence, the correct option is $\text{A}$