(D) The correct option is $(D)$.Anhydrous $CuSO_4$ is a white powder.When it reacts with water,it forms hydrated copper$(II)$ sulfate,$CuSO_4 \cdot 5H

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Adding a pinch of anhydrous $CuSO_4$

(D) The correct option is $(D)$.Anhydrous $CuSO_4$ is a white powder.When it reacts with water,it forms hydrated copper$(II)$ sulfate,$CuSO_4 \cdot 5H_2O$,which is blue in colour.Therefore,adding anhydrous $CuSO_4$ is a standard chemical test to detect the presence of water.