Question

green colour crystalline solid 'X' when heated first becomes colourless and then on further heating it becomes brown during this process two gases with the smell of burning sulphur are also evolved the brown coloured compound is........?
please explain with equation.​

Answer 1

2FeSO4--(heat)---> Fe2O3 + SO2+ SO3

here's the elaboration:-

When green coloured crystals of ferrous sulphate (FeSO4) is heated , it decomposes to form Ferric Oxide (Fe2O3) ,sulphur trioxide (SO3) and sulphur dioxide( SO2) . The sulphur dioxide gas gives the odour smell.

This Reaction is an example of Thermal Decomposition Reaction.

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