Which of the following when mixed with water form a layer on the surface?

Salt

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Sugar

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Milk

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Oil

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Solution

The correct option is D Oil
Substances like sugar, salt and milk are soluble in water. Substances like oil are insoluble in water so it forms a layer on the surface.

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Which of the following when mixed with water form a layer on the surface?

The correct option is D OilSubstances like sugar, salt and milk are soluble in water. Substances like oil are insoluble in water so it forms a layer on the surface.

The correct option is D Oil
Substances like sugar, salt and milk are soluble in water. Substances like oil are insoluble in water so it forms a layer on the surface.