Suggest the method for the purification of naphthalene.

Describe the crystallisation technique used for the purification of organic compounds.

The purification method based on the following physical transformation is $:$
$\text{Solid} (X)$ $\xrightarrow{\text{Heat}} \text{Vapour} (X)$ $\xrightarrow{\text{Cool}} \text{Solid} (X)$

Match items of Column-$I$ and Column-$II$.

Column-$I$ (Mixture of compounds)	Column-$II$ (Separation Technique)
$A$. $H_2O / CH_2Cl_2$	$I$. Crystallization
$B$. $\alpha$-tetralone / $p$-nitrophenol	$II$. Differential solvent extraction
$C$. Kerosene / Naphthalene	$III$. Column chromatography
$D$. $C_6H_{12}O_6 / NaCl$	$IV$. Fractional Distillation

Correct match is:

The correct statements among the following,for a chromatography purification method is:

What is a chromatogram?