Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II. Column I Column II (i) Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it. (a) Steam distillation (ii) Liquid that decomposes at its boiling point (b) Fractional distillation (iii) Steam volatile liquid (c) Simple distillation (iv) Two liquids which have boiling points close to each other (d) Distillation under reduced pressure (v) Two liquids with large difference in boiling points. (e) Crystallization

(i) On dissolving in solvent, the solid which is insoluble is separated out by filtration and the soluble solid is separated by crystallisation. It is a common and useful laboratory technique. It can be used to purify substances. (ii) Distillation under reduced pressure is done, because at low pressure vapours are formed below its boiling point and decomposition does not take place. (iii) A compound is said to be steam volatile if it distills under the conditions of steam distillation. Liquid is converted into vapours by passing steam followed by condensation. (iv) The vapours of such liquids are formed within the same temperature range and are condensed simultaneously. The technique of fractional distillation is used in such cases. In this technique, vapours of a liquid mixture are passed through a fractionating column before condensation. The fractionating column is fitted over the mouth of the round bottom flask. (v) Liquids having different boiling points vaporise at different temperatures. The vapours are cooled and the liquids so formed collected separately. Column I Column II (i) Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it. (e) Crystallisation (ii) Liquid that decomposes at its boiling point (d) Distillation under reduced pressure (iii) Steam volatile liquid (a) Steam distillation (iv) Two liquids which have boiling points close to each other (b) Fractional distillation (v) Two liquids with large difference in boiling points. (c) Simple distillation

MEDIUM

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What do you mean by fractional crystallisation?

Important Questions on Elements, Compounds and Mixtures

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Give a brief description of the principle of crystallisation. Give an example

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

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

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Which of the following is the example of crystallisation process?

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.

Column I	Column II
(i) Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it.	(a) Steam distillation
(ii) Liquid that decomposes at its boiling point	(b) Fractional distillation
(iii) Steam volatile liquid	(c) Simple distillation
(iv) Two liquids which have boiling points close to each other	(d) Distillation under reduced pressure
(v) Two liquids with large difference in boiling points.	(e) Crystallization

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Name and discuss the principle of the method used to separate a mixture of two organic compounds having different solubilities.

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

The two solids of variable solubilities are separated by the process of ______

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Benzoic acid is an organic compound. Its crude sample can be purified by crystallisation from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?

EASY

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

The most satisfactory method to separate sugars is to use

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

List the properties of solvents which make them suitable for crystallization.

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

Which of the following techniques is used for purification of solid organic compounds? Crystallisation or Distillation.

HARD

Science>Chemistry>Elements, Compounds and Mixtures>Separation of components of a mixture

How will you separate two components when: They are soluble in the same solvent.