Question

The method in which denser particles settle down to the bottom of the container and lighter particles stay at the top, when they are agitated, is called:

• A. decantation
• B. handpicking
• C. crystallisation
• D. centrifugation

Answer 1

The correct option is D centrifugation

Decantation is the process in which a mixture is separated by removing a layer of liquid from which a precipitate is settled. This process takes place after sedimentation.

Hand-picking is the method of separating easily identifiable material from a mixture.

Crystallisation is the process in which a mixture of solids is separated using a suitable solvent.

Centrifugation is the process in which denser particles settle down to the bottom of the container and lighter particles stay at the top.

So option $D$ is correct.