Q. 275.0( 3 Votes )
When a green iron
(a) The salt of iron which is green in colour is Iron [II] Sulphate. It occurs in hydrated form and its chemical formula is FeSO4.7H2O [Ferrous Sulphate Heptahydrate]. It is also commonly called green vitriol.
(b) According to the above-mentioned description, the reaction is a thermal decomposition reaction as ferrous sulphate decomposes to iron [III] oxide and oxides of sulphur [sulphur dioxide and sulphur trioxide] on heating. So the black colour mass obtained at the end of the reaction is Iron [III] oxide and the odour of the burning of sulphur is due to oxides of sulphur formed in the reaction.
(c) The reaction is as follows:
2FeSO4→ Fe2O3 + SO2 + SO3
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