Q 2661878725.     How would you account for the following?
(i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series.
(ii) The `E^0` value for the `Mn^3//Mn^(2+)` couple is much more positive than that for `Cr^3//Cr^(2+)` couple or `Fe^(3+)//Fe^(2+)` couple.
(iii) The highest oxidation state of a metal is exhibited in its oxide or fluoride.

CBSE-12th 2010

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