Answer :

(a) When XeF2 is hydrolysed, the following reaction takes place:

2XeF2 + 2H2O 2Xe + 4HF + O2

(b) When SO2 is passed into aqueous solution of Fe3+ salt, the following reaction takes place:

2Fe3+ + SO2 + 2H2O 2Fe2+ + SO42- + 4H+

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