Which is the best method to separate a mixture of benzoic acid and naphthalene?

In a closed container,there is a mixture of $SO_2$,$CO_2$,and $O_2$ gases. Which sequence of reagents can be helpful to separate them?
$(I)$ Limewater
$(II)$ Acidified potassium dichromate
$(III)$ Alkaline pyrogallol

According to Dalton's atomic theory,the smallest particle in which matter can exist,is called

On the basis of which physical property does the separation of different fractions in the fractional distillation technique take place?

Explain the concept of a compound.

Draw a diagram showing the setup of the apparatus for the process. Draw a diagram of a bubble plate type fractionating column. When do we require such a type of column for separating two liquids? Explain the principle involved in the separation of components of a mixture of liquids by using a fractionating column. What industrial applications does this process have?