JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The best method to test whether a clear liquid is water, is to:

(A)Taste the liquid
(B)Smell the liquid
(C)Add litmus paper
(D)Add few drops on anhydrous copper sulphate and look for colour changeCorrect

Answer: (D)

Solution

Anhydrous copper sulphate is white and turns distinctly blue on absorbing water (forming hydrated CuSOHO), providing a specific, reliable chemical test for the presence of water.

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Question ID VK-137327