When crystals of ferrous sulphate is strongly heated the residue obtained is?
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Ferrous sulphate is green in colour. On heating, the green crystals are converted into a dirty-yellow anhydrous solid as it loses water of crystallization. When further heated, the anhydrous material releases sulphur dioxide and sulphur trioxide leaving a reddish-brown iron oxide
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Ferric oxide(Fe2O3)+Sulphur dioxide(SO2)+sulphur trioxide (SO3)
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