Which of the following equations correctly represents the physical states of reactants and products?

(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

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