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Q.

When crystals of  FeSO4 are strongly heated, the residue obtained is

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a

Blue in colour

b

Red in colour

c

Green in colour

d

Colourless

answer is A.

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Detailed Solution

Because decomposition reaction takes place to form 
Fe2O3 , SO2 and SO3 2FeSO4→Fe2O3Red+SO2+SO3

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