The mustard oil or coconut oil do not mix with water and forms a separate layer

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Because oil and water are miscible liquids

Because oil is lighter than water

Because oil is heavier than water

Because oil is soluble in water

answer is B.

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Detailed Solution

The mustard oil or coconut oil do not mix with water and form a separate layer because oil is lighter than water.
Density is defined as mass per unit volume. The density of oil is less than the density of water therefore, oil is lighter than water, so it floats on the surface of water. It forms a separate layer of water. It can also be said that oil and water are immiscible liquids because they do not dissolve or mix in each other.

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