Calculate the percent dissociation of 0.02 m solution if its freezing point depression is 0.046 K .

$\left[\mathrm{K}_{\mathrm{f}}\right.$ for water $\left.=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1} ; \mathrm{n}=2\right]$

What type of solution is the iodine in air?