A) use of litmus paper
B) taste
C) smell
D) use of anhydrous copper sulphate.
Correct Answer: D
Solution :
\[\begin{matrix} \text{CuS}{{\text{O}}_{\text{4}}}\text{5}{{\text{H}}_{\text{2}}}\text{O}\rightleftharpoons \text{CuS}{{\text{O}}_{\text{4}}}\text{.3}{{\text{H}}_{\text{2}}}\text{O}\rightleftharpoons \text{CuS}{{\text{O}}_{\text{4}}}\text{.}{{\text{H}}_{\text{2}}}\text{O}\rightleftharpoons \text{CuS}{{\text{O}}_{\text{4}}} \\ Blue\,Pale\,blue\,Blusih\,white\,\,white \\ \end{matrix}\] So interaction of water in a liquid with copper sulphate will produce blue colour so water can be detected.
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