(a) Account for the following :

      (i) Manganese shows maximum number of oxidation states in 3d series.

     (ii) E^{\circ} value for Mn^{3+}/Mn^{2+} couple is much more positive than that for

           Cr^{3+}/Cr^{2+} .

      (iii)  Ti^{4+} is colourless whereas V^{4+} is coloured in an aqueous solution.

(b)   Write the chemical equations for the preparation of KMnO_{4} from MnO_{2}. Why does purple colour of acidified permanganate solution decolourise when it oxidises Fe^{2+} to Fe^{3+} ?

 

 

 

 
 
 
 
 

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