(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 ` .
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