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A reddish pink substance on heating give...

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

A

Iodine crystals

B

Copper sulphate crystals

C

Cobalt chloride crystals

D

Zinc oxide

Text Solution

Verified by Experts

The correct Answer is:
C
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