Answer:
(i) Remove iron filings with the help of magnet
Place the mixture on a paper of petridish, move a bar
magnet many times over the mixture. Iron filings get attached to the magnet and
get separated.
(ii) Remove ammonium chloride from sand and sodium
chloride by sublimation
The remaining mixture is transferred to China dish and
subjected to sublimation.
Ammonium chloride will get vaporised and change into
vapours and on condensation will form Sand
and sodium chloride will be left in China dish.
(iii) Remove sand from sodium chloride by filtration after
dissolution
Dissolve the sand and sodium chloride in water, Sodium chloride
will dissolve. Filter the solution. Sand will be left as residue and is
separated.
(iv) Get sodium chloride by evaporation or crystallization.
In the filtrate sodium chloride is present. So, evaporate the filtrate to
dryness to get sodium chloride back or use crystallisation.
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