Name two allotropes of sulphur. (ii) Describe what you observe when hydrogen sulphide is bubbled through acidified potassium tetraoxomanganate (VII) solution. Write an equation for the reaction. (

5. (a)

(i) Two allotropes of sulphur are:

• Rhombic sulphur
• Monoclinic sulphur

(ii) When hydrogen sulphide is bubbled through acidified potassium tetraoxomanganate (VII) solution:
Observation: The purple colour of the potassium tetraoxomanganate (VII) solution disappears (decolorizes), and a yellow precipitate (of sulphur) is formed.
Explanation: Hydrogen sulphide ($\text{H}_2\text{S}$) is a reducing agent and reduces the purple $\text{MnO}_4^-$ ions to colorless $\text{Mn}^{2+}$ ions, while itself being oxidized to elemental sulphur.

(iii) The