Chemistry Question Bank

Assertion (A): Oils are purified by steam distillation. Reason (R): The compounds which decompose at their boiling points can be purified by steam distillation. (AIIMS2008)

Assertion (A): During test for nitrogen with Lassaigne’s extract on adding FeCl3 solution sometimes a red precipitate is obtained. Reason (R): Sulphur is also present (AIIMS2007)

Anthracene can be purified by

Steam distillation is used only in case of steam volatile substance. Hence (c) is not correct. 4. Vaccum distillation is used in liquids which decompose at their boiling Point. Hence (d) is incorrect.

CCl4 & acetone differ in their boiling Point. So it can be seperated through fractional distillation. Hence (b) is correct.

Azeotropic distillation is used only to seperate azeotropes ie. constant boiling mixture. Here acetone & CCl4 are not azeotropic mixture. Hence (a) is not correct.

The separation of the constituents of a mixture by column chromatography depends upon their

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

An organic liquid decomposes below its boiling point. How will you purify it?

How will you separate iodine from sodium chloride?

Which of the following compound is/are purified by sublimation?

How will you purify a liquid having non-volatile impurities?

A mixture of benzene and chloroform is separated by–

In a Dumas nitrogen estimation 0.3 g of an organic compound gave 50 cm3 of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the compound (vapour pressure of water at 300K is 15 mm) is

Which of the following statements is wrong?

Dumas method involves the determination of nitrogen content in the organic compound in form of–

Kjeldahl’s method is used in the estimation of–

In Lassaigne’s test when both N and S are present, blood red colour obtained is due to the formation of–

The oxygen is estimated in the organic compound by

Which of following will give Lassaigne’s test for nitrogen

Which of the following compounds will answer Lassaigne’s test for nitrogen

Among the following which compound gives precipitate with AgNO3 solution? (a) (b) (c)

Phenol and benzoic acid can be separated by

Which of the following test can use for separation of alcohol and phenol?

Seliwanoff’s test is used for the distinguish: