X is a separation technique based on the difference in weights of the solids in a solid - solid mixture. What is X?

Sieving

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Handpicking

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Winnowing

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Threshing

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Solution

The correct option is C Winnowing
In winnowing, light weight impurities are separated from relatively heavier substances. For example, husk is separated from wheat. It is done by releasing the mixture into the air so that the wind blows away the lighter impurities, while the heavier grains fall back down for recovery.

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