Crystals of a substance changed their colour on heating in a closed ve – InterviewSolution

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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» Solution :`(i) CuSO_4. 5H_2O` `CuSO_4. 5 H_2Oto ^(Delta)CuSO_4\|5H_2O` (BLUE) (White) (ii) Explanation: On heating crystals LOSSES water of CRYSTALLISATION and REGAIN it on COOLING.

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