Preparation of potassium permanganate from Mn | vedclass

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Question

(D) The preparation of potassium permanganate $(KMnO_4)$ from pyrolusite ore $(MnO_2)$ occurs in two steps.In the $1^{st}$ step,$MnO_2$ is fused with

Vedclass · Accepted Answer

$K_2MnO_4$

Vedclass · Answer

(D) The preparation of potassium permanganate $(KMnO_4)$ from pyrolusite ore $(MnO_2)$ occurs in two steps.In the $1^{st}$ step,$MnO_2$ is fused with potassium hydroxide $(KOH)$ in the presence of an oxidizing agent like potassium nitrate $(KNO_3)$ or air to form potassium manganate $(K_2MnO_4)$.The reaction is: $2MnO_2 + 4KOH + O_2 \rightarrow 2K_2MnO_4 + 2H_2O$ or $MnO_2 + 2KOH + KNO_3 \rightarrow K_2MnO_4 + KNO_2 + H_2O$.Thus,the product of the $1^{st}$ step is $K_2MnO_4$.

Preparation of potassium permanganate from $MnO_2$ involves a two-step process in which the $1^{st}$ step is a reaction with $KOH$ and $KNO_3$ to produce:

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