paper, layer of . Give reasons : (a) Sand and sawdust cannot be separated by hand picking (b) Magnet is used to separate a mixture of iron Hon and sulphur . (c) Alum is used in purification of river water.
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Because in hand picking method substances should be large enough in size to be recognized and picked out by hand but sand and saw dust particles are very small in size so they can't be picked by hand. It can be separated by filtration.
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