(a) 2FeSO4(aq) → Fe2O3(aq) + SO2(g) + SO3(g)
(b) 2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)
(c) 2FeSO4(s) → Fe2O3(aq) + SO2(g) + SO3(g)
(d) 2FeSO4(aq) → Fe2O3(s) + SO2(g) + SO3(g)
Ans: (b) 2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)
Explanation: When crystals of ferrous sulphate (solid) are heated, it decomposes to ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). Ferric oxide is a solid, while SO2 and SO3 are gases
