1. What is the effect of heat on KMnO4 2. Give any two examples to sh

1.	1. What is the effect of heat on KMnO4 2. Give any two examples to show the oxidising property of KMnO4.
Answer» (1). On heating, KMnO₄ decomposes at 513 K into potassium manganate and oxygen gas is evolved. 2KMnO₄ \(\overset{Heat}\longrightarrow\) K₂MnO₄ + MnO₂ + O₂ (2). Two examples to show the oxidising property of KMnO₄ In acid medium it oxidises iodide to iodine. 10I^- + 2MnO₄^- + 16H⁺ → 2Mn²⁺ + 8H₂O + 5I₂ In neutral or faintly alkaline solutions it oxidises iodide to iodate. 2MnO₄^- + H₂O + I^- → 2MnO₂ + 2OH^- + IO₃^-

1. What is the effect of heat on KMnO4 2. Give any two examples to show the oxidising property of KMnO4.

Answer»

(1). On heating, KMnO₄ decomposes at 513 K into potassium manganate and oxygen gas is evolved.

2KMnO₄ \(\overset{Heat}\longrightarrow\) K₂MnO₄ + MnO₂ + O₂

(2). Two examples to show the oxidising property of KMnO₄

In acid medium it oxidises iodide to iodine.

10I^- + 2MnO₄^- + 16H⁺ → 2Mn²⁺ + 8H₂O + 5I₂

In neutral or faintly alkaline solutions it oxidises iodide to iodate.

2MnO₄^- + H₂O + I^- → 2MnO₂ + 2OH^- + IO₃^-