(A) $KMnO_4$ is prepared from the mineral pyrolusite,which is $MnO_2$. The process involves fusing $MnO_2$ with an alkali metal hydroxide (like $KOH$)

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(A) $KMnO_4$ is prepared from the mineral pyrolusite,which is $MnO_2$. The process involves fusing $MnO_2$ with an alkali metal hydroxide (like $KOH$) in the presence of air or an oxidizing agent like $KNO_3$ to form potassium manganate $(K_2MnO_4)$,which is then oxidized to potassium permanganate $(KMnO_4)$.