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Solution - Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals

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Question

Complete the following equation:

`2MnO_4^-`

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Complete the following equation :

MnO4- + 8H+ + 5e- →

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Indicate the steps in the preparation of:  KMnO4 from pyrolusite ore.

 

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Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

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Complete the following equations :

2 MnO2 + 4 KOH + O2 →

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For M2+/M and M3+/M2+ systems, the `E^theta` values for some metals are as follows:

Cr2+/Cr −0.9V

Cr3/Cr2+ −0.4 V

Mn2+/Mn −1.2V

Mn3+ /Mn2+ +1.5 V

Fe2+ /Fe −0.4V

Fe3+/Fe2+ +0.8 V

Use this data to comment upon:

(i) The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and

(ii) The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

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