Write the preparatopm of `KMnO_4` from pyrolusite ore.

Write chemical reaction for preparation of KMnO_4 from Pyrolusite ore.

Write chemical reaction for preparation of K2Cr207 from chromite ore.

Pyrolusite is an ore of

Write two ores of iron.

Write two ores of iron.

Give the preparation of Potassium Permanganate from Pyrolusite ore.

Write two ores of copper.

Why in the redox titration of KMnO_4 vs oxalic acid, we heat oxalic acid solution before starting the titration ?

Write reactions of KMnO_4 , in neutral medium with : MnSO_4

Write reactions of KMnO_4 , in neutral medium with : H_2S