Discussion Forum : Separation Of Substances
Question - Which technique involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery?
Options:
A .  Threshing
B .  Sieving
C .  Handpicking
D .  Winnowing
Answer: Option D
:
D
In winnowing, the mixture is tilted slowly from some height. Thus, the heavier element slides down while the lighter element is flown out by the action of wind.

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