Question

We can never separate chalk powder from sand by winnowing method give reason

Answer 1

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 A mixture of powdered salt and sugar can be separated by the processof winnowing. Husk and stones couldbe separated from grains by handpicking. Husk is separated from heavier seeds of grain by winnowing. ... Filtration can be used to separatecomponents of a mixture of an insoluble solid and a liquid.

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Answer 2

Because chalk powder has very small  particles which cannot be removed from sand by winnowing method