MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryHydrogenAuto – protolysis [Self ionization]

Presence of water can be detected by

A.adding a drop to anhydrous copper sulphate which✓ Correct

B.by boiling & testing for the presence of H2 & O2

C.by seeing its colour and transparency

D.by checking the production of lather when mixed

Explanation

Presence of water can be detected by copper sulphate test. As we know, 4 2 .5 CuSO H O (copper sulphate pentahydrate) is blue in colour due to its 5 water molecules of crystallization. While anhydrous 4 CuSO is white in colour. Therefore, by the addition of water to anhydrous copper sulphate, it can be easily detected.

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