The removal of iron nails from a pile of dust can be achieved by the process of:

A) threshing
B) decantation
C) sedimentation
D) magnetic separation

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Solution

Correct answer is option D) magnetic separation.
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A magnet can be used to separate iron nails from sand, as iron nails get attracted towards the magnet whereas the sand remains as such. This process is called as magnetic separation.

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