CBSE Class 10 Science 2019 · Paper 31/5/1 · Question 8(a)

(a) Any two: the pale green crystals turn white as they lose their water of crystallisation (droplets of water appear near the mouth of the tube); a reddish-brown solid, ferric oxide (${\text{Fe}}_2{\text{O}}_3$), is left; gases with the smell of burning sulphur (${\text{SO}}_2$ and ${\text{SO}}_3$) are given off. (b) Thermal decomposition reaction. (c) $2{\text{FeSO}}_4(s)\stackrel{\text{heat}}{\to }{\text{Fe}}_2{\text{O}}_3(s)+{\text{SO}}_2(g)+{\text{SO}}_3(g)$. Products: ferric oxide (iron(III) oxide), sulphur dioxide and sulphur trioxide.