Which of the following phrases correctly describes a racemic mixture?

Question

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A racemic mixture is an equal mixture of two enantiomers. This means that the mixture is not optically active, as the two enantiomers rotate plane-polarized light in opposite directions, leading to cancellation of any optical activity. Diastereomers, on the other hand, have different physical and chemical properties, and so an equal mixture of diastereomers would not be a racemic mixture.

Which of the Following Phrases Correctly Describes a Racemic Mixture