152. Give reasons for the following:
The second and third transition series elements have almost similar atomic radii.

Calculate the number of unpaired electrons in following gaseous ions: Mn³⁺, Cr³⁺, V³⁺ and Ti³⁺, which one of these is the most stable in aqueous solution?

Give example and suggest reasons for the following features of the transition metal chemistry:
The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.

Give example and suggest reasons for the following features of the transition metal chemistry:
A transition metal exhibits highest oxidation state in oxides and fluroides.

Give example and suggest reasons for the following features of the transition metal chemistry:
The highest oxidation state is exhibited in oxoanions of a metal.

Indicate the steps in the preparation of  K₂Cr₂O₇ from chromite ore.

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