Question

19
a) Crystals of a substance 'X' changed their colour on heating in a closed
test tube but regained it after some time when they were allowed to cool
down. Name the substance and write its formule. 19,
b) Define and explain the above phenomenon.
c) Write a balanced chemical equation involved in the preparation of
sodium hydroxide, Name the process.​

Answer 1

Answer:

Crystals of a substance which changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down are copper sulphate or more specifically hydrated copper sulphate.

Its formula is – CuSO4.5H2O