Identify the substance that forms a layer on the surface when it is mixed with water.

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Solution

Salt and sugar are soluble in water. Hence, they disappear after adding them to water.
Milk also gets dissolved when added to the water.
Oil is insoluble in water and its density is lower than that of water. Hence, it floats on top of water.

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Identify the substance that forms a layer on the surface when it is mixed with water.

Salt and sugar are soluble in water. Hence, they disappear after adding them to water. Milk also gets dissolved when added to the water. Oil is insoluble in water and its density is lower than that of water. Hence, it floats on top of water.

Salt and sugar are soluble in water. Hence, they disappear after adding them to water.
Milk also gets dissolved when added to the water.
Oil is insoluble in water and its density is lower than that of water. Hence, it floats on top of water.