A highly impure sample of benzoic acid is contaminated with naphthalene. Which of the following techniques would be LEAST effective for purifying the benzoic acid?

In estimation of nitrogen by Duma's method 1.18 g of an orgainc compound gave 224 mL of ${N_2}$ at NTP. The percentage of nitrogen in the compound is

A mixture containing equal amounts of ortho-nitrophenol and para-nitrophenol needs to be separated. Which of the following separation methods exploits the difference in their volatility due to intramolecular and intermolecular hydrogen bonding?

Which of the following methods is most suitable for purifying a metal that is liquid at room temperature?

Which of the following is the MOST suitable solvent for recrystallizing a compound that is highly soluble in hot ethanol but sparingly soluble in cold ethanol?

Which purification technique is MOST suitable for separating a thermally unstable liquid organic compound from a non-volatile impurity?

A mixture of benzene and $CHC{l_3}$ is separated by

The suitable method for separation of a mixture of ortho and para nitrophenols is

A mixture of benzene and $CHC{l_3}$ is separated by

The best method for the separation of naphthalene and benzoic acid from their mixture is

When an organic compound is present in aqueous medium and is less soluble in any organic solvent, then it is separated by