a) The process of picking out undesirable solids from another solid.
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Sedimentation, Decantation And Filtration
Explanation:
They are used for separating soluble and insoluble solids from a mixture of solids and liquid. Sedimentation: Insoluble particles settle down at the bottom and the process is called sedimentation.
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Answer: Hand-picking is a method of separation by which impurities that are different from the useful material in a mixture are hand-picked and removed. For example, rice, wheat, pulses, etc., contain impurities such as small stones or unwanted grains.
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