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Question

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

A
Taste
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B
Smell
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C
Use of litmus paper
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D
Use of anhydrous copper sulfate
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Solution

The correct option is D Use of anhydrous copper sulfate
Anhydrous copper sulfate (CuSO4) is used to test whether the solution contains water or not. If water is present the solution becomes blue when you add CuSO4 to it.
Hence option D is correct.

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