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(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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