What is the process of converting a solid directly into a gaseous state called?

Suggest a method for the separation of a mixture of methanol and acetone.

Name the appropriate method to separate a mixture of calcium sulfate and camphor.

Explain the classification of matter based on chemical properties (macroscopic level).

You have a mixture of three liquids $A$,$B$,and $C$. There is a large difference in the boiling points of $A$ and the rest of the two liquids,i.e.,$B$ and $C$. The boiling points of liquids $B$ and $C$ are quite close. Liquid $A$ boils at a higher temperature than $B$ and $C$,and the boiling point of $B$ is lower than that of $C$. How will you separate the components of the mixture?

Define the nature of matter.