1.

Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down.(i) Name one such substance.(ii) Explain the phenomenon involved.

Answer»

(i) CuSO4.SH2O

CuSO4.5H2O Heat CuSO4+5H2O

CuSO4.5H2O-(Blue)

CuSO4+5H2O-(White)

(ii) Explanation: On heating, crystal loses water of crystallisation and regain it on cooling



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