Question

Bhawana took a pale green substance ‘A ‘ in test tube. And heated it

over the flame of a burner. A brown colored Residue ‘B’ was formed

along with the evolution of two gases with burning smell of Sulphur.

Identify A and B write the chemical reaction involved.

Answer 1

A- FeSO4
B- Fe2O3

feSO4 ----->  Fe2O3 + SO2 + SO3

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Answer 2

The substance A is ferrous sulphate . When it is heated ferric oxide ,sulphur trioxide and sulphur dioxide is formed . The colour of the gas sulphur trioxide is brown . Hence ,sulphur trioxide is B .
FeSO4-> Fe2O3 +SO2 +SO3