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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. |
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Answer» Solution :(i) Due to lanthanoid contraction OR its MEANING, (ii) Due to STABLE half-filled `3d^5` CONFIGURATION of `MN^(2+)// "high " 3^(rd)` ionisation enthalpy of Mn. |
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