The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolved 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?
(a)(i) Constituent A is a yellow coloured solid element. Hence, it could be sulphur.
(ii) Sulphur dissolves in liquid D. Hence, liquid D could be carbon disulphide.
(b) (i) Constituent B is a blue coloured salt, which is insoluble in carbon disulphide but dissolves in water. Hence, it could be copper sulphate.
(ii) Liquid E could be water as it dissolves in copper sulphate.
(c) Liquid C could be vegetable oil as it turns into a solid fat on hydrogenation.
(d) We will separate the mixture containing A, B, and C by the following process:
- Filter the mixture of A, B, and C.
- Vegetable oil (C), being liquid, will be obtained as a filtrate.
- The residue consists of A (sulphur) and B (copper sulphate).
- Add water to the residue and shake it before filtering. A (sulphur) is obtained as residue.
- On evaporating the filtrate, we obtain B (copper sulphate).
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