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Presence of water can be detected by...

Presence of water can be detected by

A

adding a drop to anhydrous copper sulphate which changes its colour from white to blue

B

by boiling and testing for the presence of `H_(2)` and `O_(2)`

C

by seeing its colour and transparency

D

by checking the production of lather when mixed with soap.

Text Solution

Verified by Experts

The correct Answer is:
A
Anhydrous `CuSO_(4)` is white which on reaction with `H_(2)O` forms hydrated `CuSO_(4)` which is blue in colour.
`underset("(anhydrous, white)")(CuSO_(4))+5H_(2)O to underset("(hydrated, blue)")(CuSO_(4).5H_(2)O)`
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