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प्रश्न
Indicate the steps in the preparation of KMnO4 from pyrolusite ore.
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उत्तर १
Potassium permanganate can be made by the following methods:
It is produced industrially by the electrolytic oxidation of manganate(VI) followed by the alkaline oxidative fusion of MnO2.
\[\ce{MnO2 ->[{Fused with KOH, oxidised with air or KNO3}] \underset{{manganate ion}}{MnO^{2-}_4}}\]
\[\ce{\underset{{manganate ion}}{MnO^{2-}_4} ->[{Electrolytic oxidation in alkaline solution}] \underset{{permanganate ion}}{MnO^-_4}}\]
The chemical reactions of acidic potassium permanganate with SO2 are as follows –
\[\ce{2MnO4 + 2H2O + 5SO2 -> 2Mn^{2+} + 4H^+ + 5SO^{2-}_4}\]
उत्तर २
\[\ce{2MnO2 + 4KOH + O2 ->[\Delta] 2K2MnO4 + 2H2O}\]
\[\ce{3MnO^2-_4 + 4H+ -> 2MnO^-_4 + MnO2 + 2H2O}\]
Notes
Students can refer to the provided solutions based on their preferred marks.
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संबंधित प्रश्न
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`2MnO_4^(-)+6H^++5NO_2^(-)rarr`
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Give an example and suggest a reason for the following feature of the transition metal chemistry:
The highest oxidation state is exhibited in oxoanions of a metal.
Indicate the steps in the preparation of K2Cr2O7 from chromite ore.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Complete the following equations:
`2MnO_4^(-)+16H^++5S^(2-)rarr`
Which of the following reactions are disproportionation reactions?
(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]
(b) \[\ce{3MnO^{-}4 + 4H^{+} -> 2MnO^{-}4 + MnO2 + 2H2O}\]
(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]
(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]
Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?
(i) \[\ce{KMnO4}\]
(ii) \[\ce{Ce(SO4)2}\]
(iii) \[\ce{TiCl}\]
(iv) \[\ce{Cu2 Cl2}\]
Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
