Anthraquinone is prepared by the oxidation of anthracene by chromic acid. The crude reaction product is usually purified by

A sample of liquid gallium contains traces of indium and tin. Which of the following methods is best suited for purifying the gallium?

In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to

Impure glycerine can be purified by

Sublimation can't be used for purification of

A mixture of two organic compounds $A$ and $B$ can be separated by (B. P of $A = {80^0}C$, B. P of $B = {110^0}C$)

Glycerol can be separated from spent-lye in soap industry by

Glycerol can be separated from spent-lye in soap industry by

An organic compound on heating with CuO produces ${\rm{C}}{{\rm{O}}_2}$ but no water. The organic compound may be

In a solution, solvent can be separated from solute by one of the following process

The best method to separate the mixture of $ortho -$ and $- para$ nitrophenol (1:1) is