A substance 'x' is green in colour .it changes to reddish brown if kept in air for long time. 'x' decomposes brown coloured metal oxide 'y' along with two oxides of non metals . Identify 'y' and write the chemical reaction involved

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Solution

A substance which is green in colour is Iron sulphate (FeSO₄) . X is iron sulphate. When it is kept in air for a long time it will form a reddish brown substance called ferric oxide. Y is ferric oxide. The reaction will be :
2FeSO₄ $\to$ Fe₂O₃+ SO₂ + SO₃

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