How do you perform the purification of the following?
$(i)$ The boiling point of liquid $X$ is $450 \ K$ and it decomposes at $400 \ K$ temperature.
$(ii)$ Mixture of $60 \% \ \text{Camphor}$ and $40 \% \ BaSO_4$.

(N/A) $(i)$ Distillation under reduced pressure (or vacuum distillation) is used because the liquid decomposes below its boiling point.
$(ii)$ Sublimation is used because camphor is a sublimable solid,while $BaSO_4$ is non-sublimable.