Which of the following solids is insoluble in water?

Coffee powder

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Salt

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Sand

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Sugar

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Solution

The correct option is C Sand
Solids that can dissolve in water and do not leave a residue are said to be soluble in water. Out of the given options, salt, sugar, and coffee powder dissolve in water and form solutions. But sand does not dissolve in water. Sand settles down at the bottom of water and forms a suspension.

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