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प्रश्न
E0 value for Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.
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उत्तर
Much larger 3rd ionisation energy of Mn (where the required change is d5 to d4) is mainly responsible for this.
Mn3+ = 
Mn2+ = 
→ Half filled (more stable)
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संबंधित प्रश्न
Complete the following equations:
Complete the following equation:
\[\ce{2MnO4- + 6H+ + 5NO2- ->}\]
Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?
Answer the following question.
When MnO2 is fused with KOH in the presence of KNO3 as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in an acidic solution to give a purple compound (B). An alkaline solution of compound (B) oxidizes KI to compound (C) whereas an acidified solution of compound (B) oxidizes KI to (D). Identify (A), (B), (C), and (D).
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) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]
What is the effect of pH on dichromate ion solution?
Potassium permanganate on heating at 513 K gives a product which is ______.
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.
