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CBSE Class 12-science Answered

Please answer fast. Write the equations involved in the presentation of KMnO4 from Pyrolusite ore
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Asked by varma.renu9481 | 01 Mar, 2023, 12:09: PM
answered-by-expert Expert Answer
Dear Student,

The correct question is:

Write the equations involved in the preparation of KMnO4 from Pyrolusite ore.

 It is prepared from the mineral, pyrolusite, MnO2, for large scale preparation.

The preparation involves following steps; 

(a)  Conversion of MnO2 into potassium manganate:

The finely crushed pyrolusite mineral is fused with potassium hydroxide in presence of air or oxidizing agent such as potassium nitrate. The green coloured potassium manganate is formed.

2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O
2MnO2 + 2K2CO3 + O2 → 2K2MnO4 + 2CO2
MnO2 + 2KOH + KNO3 → K2MnO4 + KNO2 + H2O
3MnO2 + 6KOH + KClO3 → 3K2MnO4 + KCl + 3H2O
 
If this solution is allowed to stand for some time, potassium manganate is then undergoes disproportionation in the neutral or acidic solution.
Answered by | 01 Mar, 2023, 01:00: PM
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