The green colour crystals that the student heated were of ferrous sulphate crystals (FeSO4). These crystals when heated undergoes decomposition reaction and breaks into ferric oxide, sulphur dioxide and sulphur trioxide (SO3). The green colour of FeSO4 crystals thus changes to reddish brown ferric oxide (Fe2O3) and then the smell of burning sulphur (SO2) is evolved.
2FeSO4→ Fe2O3 + SO2 + SO3 (In presence of heat, the reaction proceeds.)
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