(i) Name the element of 3d transition series which shows maximum number of oxidation
states. Why does it show so ?
(ii)Which transition metal of 3d series ha positive `E^(@)(M^(2+)//M)` value and why ?
(iii) Out of `Cr^(3+) and Mn^(3+)`, which is a stronger oxidizing agent and why ?
(iv) Name a member of the lanthanoid series which is well known to exhibit + 2 oxidation state.
(v) Complete the following equation : `MnO_(4)^(-) + 8H^(+) + 5e^(-) to ` .