Which of the following contains only one element?

$A$ mixture of sand and iodine can be separated by

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.

What are the macroscopic properties of matter?

Describe the method,which can be used to separate two compounds with different solubilities in a solvent $S$.

Percentage of lead in lead pencil is