# (a) Account for the following :      (i) Manganese shows maximum number of oxidation states in 3d series.     (ii) $\inline E^{\circ}$ value for $\inline Mn^{3+}/Mn^{2+}$ couple is much more positive than that for           $\inline Cr^{3+}/Cr^{2+}$ .      (iii)  $\inline Ti^{4+}$ is colourless whereas $\inline V^{4+}$ is coloured in an aqueous solution.(b)   Write the chemical equations for the preparation of $\inline KMnO_{4}$ from $\inline MnO_{2}$. Why does purple colour of acidified permanganate solution decolourise when it oxidises $\inline Fe^{2+}$ to $\inline Fe^{3+}$ ?

### Preparation Products

##### Knockout KCET 2021

An exhaustive E-learning program for the complete preparation of KCET exam..

₹ 4999/- ₹ 2999/-
##### Knockout KCET JEE Main 2021

It is an exhaustive preparation module made exclusively for cracking JEE & KCET.

₹ 27999/- ₹ 16999/-
##### Knockout NEET Sept 2020

An exhaustive E-learning program for the complete preparation of NEET..

₹ 15999/- ₹ 6999/-
##### Rank Booster NEET 2020

This course will help student to be better prepared and study in the right direction for NEET..

₹ 9999/- ₹ 4999/-