Which of the following is an example of a heterogeneous mixture?

Name a suitable technique for the separation of the components from a mixture of calcium sulphate and camphor.

Classify matter according to physical state.

What method can be used for the separation of two volatile liquids that have a significant difference in their boiling points?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ $A$ mixture contains benzoic acid and naphthalene. The pure benzoic acid can be separated out by the use of benzene.
Reason $R:$ Benzoic acid is soluble in hot water.
In the light of the above statements,choose the most appropriate answer from the options given below.

$A$ mixture of iodine and sodium sulphate is separated by: