Question

A green coloured hydrated metallic salt on heating loses its water of crystallisation molecules and gives the smell of burning sulphur. Identify the salt and write the equation.

Answer 1

green viterol Fe so4.7h20 looses it's water of crystalization on heating and gives out the smell of burning sulphur
equation-:
feso4(s) on heating gives fe2o3(s) + so2(g) + so3(g)

Answer 2

the salt is FeSO4 ( Ferrous sulphate )

the reaction takes place in two steps :

first step:

FeSO4.7H2 -----heat----> FeSO4 + 7H2O

second step:

FeSO4 ----heat--->     Fe2O3        +       SO2             +        SO3

                            (Ferric Oxide)   (Sulphur Dioxide)   (Sulphur Trioxide)