A reddish-pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. If on cooling water is added to the residue, it turns to its original colour. The substance is

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Iodine crystals

Copper sulphate crystals

Cobalt chloride crystals

Zinc oxide

answer is C.

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Detailed Solution

It is a property of CoCl2.

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