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Question

To separate a mixture of iron fillings, sulphur powder and iron sulphide, which sequence of methods can be used ?


A

Magnet, dissolve in CS2, filter, evaporation

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B

magnet, dissolve in water, filter, evaporation

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C

dissolve in water, filter, crystallize, decant

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D

magnet, filter, decant, crystallize.

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Solution

The correct option is A

Magnet, dissolve in CS2, filter, evaporation


The explanation for the correct option:

(a) Magnet, dissolve inCS2, filter, evaporation:

  1. We are given a mixture of iron fillings, sulphur powder and iron sulphide. We have to separate the components of this mixture.
  2. Firstly, we will use a magnet to separate iron fillings from the mixture. As we know that iron is a metal it will cling to the magnet.
  3. Secondly, we will dissolve the sulphur powder and iron sulphide in carbon-disulphide.
  4. Thirdly, we will use filter paper to separate iron sulphide and the filtrate.
  5. Finally, we evaporate the filtrate to get sulphur powder.

The explanation for incorrect options:

Since the correct sequence of methods used to separate a mixture of iron fillings, sulphur powder and iron sulphide are first to use a magnet, dissolve inCS2, filter, and then finally evaporation thus options (b), (c) and (d) are incorrect.

Hence, option (a) is the correct option.


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