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Presence of water can be tested with...

Presence of water can be tested with

A

adding a pinch of 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 coloured and transparency

D

by checking the production of lather when mixed with soap

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The correct Answer is:
A
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