The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. the constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. the constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.

(a) What do you think could (i) constituent A, and (ii) liquid D be ?

(b) What could (i) constituent B, and (ii) liquid E be ?

(c) What could liquid C be ?

(d) How will you separate the mixture containing A, B and C ?

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Solution

(a)
(i) Constituent A could be sulphur.
(ii) Liquid D could be carbon disulphide.

(b)
(i) Constituent B could be copper sulphate.
(ii) Liquid E could be water.

(c) Liquid C could be vegetable oil.

(d) Filter the mixture of A, B and C. C(oil) being liquid will be obtained as a filtrate. Residue consists of A(sulphur) and B(copper sulphate). Add water to the residue mixture, shake and filter. A(sulphur) is obtained as residue. Now, evaporate filtrate to obtain B(copper sulphate).

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Mixtures	Methods to separate mixtures
(a) Solid-liquid mixture (insoluble solid)	(i) Sublimation
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(b) Immiscible liquids are separated by using a ........................
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(d) The separation of liquids by fractional distillation is based on the difference in their ............................
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Question 35
Colligative properties are observed when .......... .
(a) a non-volatile solid is dissolved in a volatile liquid
(b) a non-volatile liquid is dissolved in another volatile liquid
(c) a gas is dissolved in non-volatile liquid
(d) a volatile liquid is dissolved in another volatile liquid

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