Question

identify the exothermic & endothermic reaction. i) heating of ferrous sulphate crystals​

Answer 1

Answer:

(B) decomposition and redox.

Explanation

The chemical reaction for strong heating of ferrous sulphate is written as:

2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)

On heating, it loses water and anhydrous ferrous sulphate (FeSO4) is formed. As a result of which, the colour changes from light green to white. On heating further, anhydrous ferrous sulphate decomposes and form ferric oxide Fe2O3(s) ) which is a brown coloured solid, sulphur dioxide SO2(g) ) and sulphur trioxide SO3(g) ). So, the gas emitted smells like burning sulphur.

It is evident from the reaction that the single reactant FeSO4 decomposes to form three different products. Therefore, the reaction is a decomposition reaction. Since, Fe(II) is oxidized to Fe(III) and S (VI) is reduced to S (IV), it is a redox reaction.