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1.

In sodium extract test of organic compounds, the nitrogen of an organic compound is converted into`:`A. sodamideB. sodium cyanideC. sodium nitriteD. sodium nitrate

Answer» Correct Answer - B
When the nitrogen containing compound is heated with sodium , then nitrogen and carbon of organic compound converted into sodium cyanide .
`Na + " " underset("From organic compound")ubrace(C+N) " " NaCN`
Discussion
2.

A is a lighter phenol and B is an aromatic carboxylic acid . Separation of a mixture of A and B can be carried out easily by using a solution ofA. sodium hydroxideB. sodium sulphateC. calcium chlorideD. sodium bicarbonate

Answer» Correct Answer - D
Carboxylic acids are soluble in sodium bicarbonate but phenol are not dissolve in it , so they are separated because carboxylic acid react with `NaHCO_(3)` and form sodium carboxylate
`R-COOH + NaHCO_(3) to R-COO^(-)Na^(+) + H_(2)CO_(3)`
Discussion
3.

The best method for the separation of naphthalene and benzoic acid from their mixture isA. chromatographyB. crystallisationC. distillationD. sublimation

Answer» Correct Answer - D
The best method for the separation of naphthalene and benzoic acid from their mixture is sublimation because it is applicable for those organic compounds which pass directly from solid to vapour state on heating and vice versa on cooling . In these compounds naphthalene is volatile and benzoic acid is non-volatile due to the formation of dimer via hydrogen bonding (intermolecular)
Discussion
4.

Prussian blue is formed whenA. ferrous sulphate reacts with `FeCl_(3)`B. ferric sulphate reacts with `Na_(4)[Fe(CN)_(6)]`C. ferrous ammonium sulphate reacts with `FeCl_(3)`D. ammonium sulphate reacts with `FeCl_(3)`

Answer» Correct Answer - B
When the sodium fusion extract is added with `FeCl_(3)` and then the resulting solution is acidified with dilute hydrochloric acid , the appearance of Prussian blue colouration confirms the presence of nitrogen in the organic compound.
`Na + C + N to NaCN `
`FeSO_(4) + 2NaCN to Fe(CN)_(2) + Na_(2)SO_(4)`
`Fe(CN)_(2) + 4NaCN to Na_(4) [Fe(CN)_(6)]`
`3 Na_(4)[Fe(CN)_(6)] + 4FeCl_(3) to underset("Prussian blue")(Fe_(4)[Fe(CN)_(6)]_(3)) + 12 NaCl`
Discussion
5.

In steam distillation of toluene , the pressure of toluene in vapour isA. equal to the pressure of barometerB. less than the pressure of barometerC. equal to vapour pressure of toluene in simple distillationD. more than vapour pressure of toluene in simple distillation

Answer» Correct Answer - B
In steam distillation of toluene , the pressure of toluene in vapour is less than pressure of barometer , because it is carried out when a solid or liquid is insoluble in water and is volatile with steam but the impurities are non-volatile.
Discussion