You are purifying a sample containing p-nitroaniline and o-nitroaniline. Exploiting the difference in their basicity, which method would be most effective for separating these isomers?
Fractional distillation
Simple recrystallization from water
Dissolving the mixture in dilute HCl and then selectively precipitating p-nitroaniline by careful neutralization with dilute NaOH
Steam distillation
Related Questions
Which purification technique is MOST suitable for separating a thermally unstable liquid organic compound from a non-volatile impurity?
Simple distillation
Fractional distillation
Steam distillation
Vacuum distillation
Fractional distillation is useful in distillation of
Petroleum
Coal-tar
Crude alcohol
All of these
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?
Simple distillation
Sublimation followed by recrystallization
Recrystallization from hot water
Treatment with sodium bicarbonate followed by acidification
Steam distillation is based on the fact that vaporisation of organic liquid takes place at
Lower temperature than its boiling point
Higher temperature than its boiling point
Its boiling point
Water and organic liquid both undergo distillation
In paper chromatography, the separation of components primarily relies on differences in their:
Solubility in the stationary and mobile phases
Molecular size
Volatility
Density
Which of the following process is not used for the purification of solid impurities?
Distillation
Sublimation
Crystallisation
Vaporisation
A mixture of benzoic acid and benzamide is dissolved in diethyl ether. Which of the following would be the MOST efficient method to separate the two compounds?
Fractional distillation
Recrystallization from hot water
Extract the ethereal solution with aqueous sodium bicarbonate, then acidify the aqueous layer to recover benzoic acid; evaporate the ether to recover benzamide.
Steam distillation
A liquid decomposes at its normal boiling point. It can be purified by
Sublimation
Steam distillation
Vacuum distillation
Fractional distillation
Lassaigne's test is used for the detection of
Carbon only
Hydrogen only
Oxygen only
Nitrogen, sulphur and halogens
Chromatography is a valuable method for the separation, purification and identification of the constituents of a mixture and it is based on general principle of
Differential affinities of the components of mixture towards stationary and mobile phase
Same affinities of the components of mixture towards stationary and mobile phase
Differential boiling points of the components of mixture
Differential melting points of the components of mixture
