Racemic mixture.

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It has been found that when two enantiomers of a substance are mixed in exactly equal amounts, then the mixture so obtained is optically inactive. When plane polarized light is passed through the aqueous solution of this mixture, then the rotation due to one isomer in one direction cancels the rotation due to the other isomer in the other direction, such an optically inactive mixture is called racemic mixture or racemic modification or racemlsation.

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