How would you confirm that a colourless liquid given to you is pure water ?

Explanation

This can be confirmed by the following experiments :
(i) Filter the colourless liquid through a very fine filter paper. If no residue is left on the filter paper, this means that the liquid is pure water and has no suspended impurities present in it.
(ii) Evaporate the colourless liquid in a china dish or beaker. In case no residue is left, this means that it is pure water and has no dissolved impurities present in it.
(iii) Determine the boiling point of pure liquid. If it comes out to be nearly 373 K `(100^(@)C)`, this means that the pure liquid is water.