A green coloured iron salt x on heating a gas why is evolved which has a burning sulphur smell and red brown residue z is left identify x y z
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x is ferrous sulphate hepta hydrate also known as green vitriol FeSO4.7H2O[ hydrated because green vitriol is green only when it has water of crystallization(here 7 mole) in it]
y is so2 sulphur dioxide along with some so3 sulphur trioxide
z is ferric oxide or iron 3 oxide Fe2O3
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