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Explain the preparation of potassium p...

Explain the preparation of potassium permanganate from pyrolusite

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Potassium permanganate is prepared from pyrolusite `(MnO_(2))` ore. The preparation involves the following steps .
(i) Conversion of `MnO2` to potassium manganate : Powdered ore is fused with KOH in the presence of air or oxidising agents like KNO or `KCI_(3)` A green coloured potassium manganate is formed
`2MnO_(2) + 2KOH + O_(2) to underset("potassium manganate" ) (K_(2) MnO_(4)) + 2H_(2) O`
(ii) Oxidation of potassium manganate to potassium permanganate : Potassium manganate thus obtained can be oxidised in two ways ,either by chemical oxidation or electrolytic oxidation.
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SURA PUBLICATION-TRANSITION AND INNER TRANSITION ELEMENTS-Short Answer
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  3. What are redox reactions ?

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  4. Complete the following reactions? (i) Cr^(2) + 2e^(-) to (ii) Mn...

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  5. Write the properties of intersitial compound.

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  6. Do transition elements form complex co- ordinate compounds ?

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  7. What is chromyl chloride test ? Give equation

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  8. What are the uses of potassium dichromate ?

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  9. Explain the preparation of potassium permanganate from pyrolusite

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  10. What happens to potassium permanganate on chemical oxidation ?

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  11. Give the ionic reaction of electrolytic of aqueous solution of K...

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  12. What happens to KMnO(4) when it reacts with (i) cold conc. H(2) ...

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  13. Explain the oxidising property of KMnO(4) in neutral medium .Giv...

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  14. Explain the oxidising property of KMnO(4) in alkaline medium .

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  15. Explain the oxidising property of KMnO(4) in acid medium

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  16. Why HCI and HNO(3) cannot be used for making the KMnO(4) medium ...

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  17. Give the uses of KMnO(4)

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  18. What are the causes of lanthanoids contraction ?

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  19. Draw the structure of dichromate ion.

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  20. Which is the last element in the series of the actinoids ? Write...

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