A) Use of anhydrous copper sulphate
B) Use of litmus paper
C) Taste
D) Smell
Correct Answer: A
Solution :
Anhydrous copper sulphate is white in colour. It readily absorbs moisture to give hydrated copper sulphate (\[CuS{{O}_{4}}.5{{H}_{2}}O,\]blue vitriol) which is blue. Thus even a trace of moisture can be identified by using anhydrous\[CuS{{O}_{4}}.\]
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