Question

2. a) Crystals of a substance changed their color on heating in a closed test tube but regama
after some time when they were allowed to cool down. Name the substance and write its form
Explain the phenomenon.
10​

Answer 1

Answer:

this happens as a result of dehydration of the substance.Here this is copper sulphate

CuSO4.5H2O ----> CuSO4 + 5H20

anhydrous

copper sulphate

This is a reversible process.the substance regains its colour on cooling because it gets moisture from the air and gets hydrated.

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