Sedimentation and decantation are useful to separate

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Immiscible liquids

Soluble solids from liquids

Insoluble solid from liquids

Insoluble solid from a liquid where the solid is heavier than the liquid

answer is D.

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Detailed Solution

Sedimentation and decantation are useful to separate an insoluble solid from a liquid where the solid is heavier than the liquid.
An insoluble solid suspended in a liquid can be separated from that liquid by letting the insoluble solid settle down at the bottom, and this process is called sedimentation. The insoluble solid that settles down is known as sediment, and the clear liquid that comes up is known as supernatant. The impurities do not dissolve in water or liquid. They will settle down at the bottom of the container, and clear water or liquid will rise up. Decantation removes the liquid layer from a mixture that is free from the residue. So, using the decantation method, we can pour the water or liquid into another container; thus, the impurities are separated from a mixture.

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