Which of the following is best scientific method to test presence of water in a liquid?

Taste

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Smell

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Use of litmus paper

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Use of anhydrous copper sulfate

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Solution

The correct option is D Use of anhydrous copper sulfate
Anhydrous copper sulfate $(C u S O_{4})$ is used to test whether the solution contains water or not. If water is present the solution becomes blue when you add $C u S O_{4}$ to it.
Hence option D is correct.

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