Question

A certain compound A is blue in colour. Upon strong heating, it changes to another compound B which is white in
colour, The compound B again changes to A in the presence of moisture. Identify the compound A and B
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Answer 1

Answer:

A - CuSO4.H20 B - CuSO4

Presence of water makes CuSO4 blue.

Answer 2

Answer:

CuSo4.H2O is the compound with blue colour . The presence of water makes it blue

And whent heated water vapourisis and CuSo4 is left which is White