Select the material which is insoluble in water.

Sugar

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Salt

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Chalk powder

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Oxygen gas

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Solution

The correct option is D Chalk powder
Some substances like salt and sugar completely disappear when mixed with water. Thus, they are soluble in water. Other substances like chalk powder do not mix with water or disappear. They are insoluble in water. Some gases like oxygen also dissolve in water (soluble). This dissolved oxygen is important for the survival of many aquatic animals.

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