When the difference in boiling points of two liquids is very small,the separation is carried out by:

$A$ liquid contains a non-volatile impurity. Which technique will be applied for its purification?

What is the characteristic of $R_f$ value?

$A$ flask contains a mixture of isohexane and $3-$methylpentane. One of the liquids boils at $63^{\circ}C$ while the other boils at $60^{\circ}C$. What is the best way to separate the two liquids and which one will be distilled out first?

Match Column-$I$ and Column-$II$ with the correct relation:

Column-$I$	Column-$II$
$(i)$ Aniline + chloroform	$(p)$ Steam distillation
$(ii)$ Aqueous solution of compound	$(q)$ Fractional distillation
$(iii)$ Mixture of liquids with small difference in boiling point	$(r)$ Differential extraction
$(iv)$ Purification of aniline	$(s)$ Simple distillation

Which of the following statements is incorrect for paper chromatography?