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

Salt

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Sugar

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Oil

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Milk

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Solution

The correct option is C Oil
Salt and sugar are soluble in water. Hence they disappear after adding them to water. Milk also gets dissolved when added to the water. But oil is insoluble in water. Its density is lower than the water and hence it floats on the top of the water.

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

The correct option is C OilSalt and sugar are soluble in water. Hence they disappear after adding them to water. Milk also gets dissolved when added to the water. But oil is insoluble in water. Its density is lower than the water and hence it floats on the top of the water.

The correct option is C Oil
Salt and sugar are soluble in water. Hence they disappear after adding them to water. Milk also gets dissolved when added to the water. But oil is insoluble in water. Its density is lower than the water and hence it floats on the top of the water.