A reddish-pink substance on heating gives off a vapour which condences – InterviewSolution

1.	A reddish-pink substance on heating gives off a vapour which condences on the sides of the test tube and the substance turns blue. Il on cooling water is added to the residue it turns to its original colour. The substance is :
Answer» IODINE sulphate CRYSTALS Copper sulphate crystals Cobalt CHLORIDE crystals Zinc oxide Answer :C

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