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Account for the following: (i) Transition elements exhibit higher enthalpies of atomisation. (ii) Cr^(2+) is reducing and Mn^(3+) is oxidising when both have d^4 configuration. |
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Answer» Solution :(i) The transition elements exhibit high enthalpies of ATOMIZATION because they have large number of unpaired `e^(-)` in their atoms. Due to which they have STRONGER interatomic interaction and hence stronger BONDING between atoms. (ii) Of the d species `CR^(2+)` is strong reducing while `MN^(3+)` is strongly oxidising. `Cr^(2+)`is reducing as its configuration changes from `d^(4)` to `d^3` host 2g configuration which is half-filled `Mn^(3+)` is oxidising because its configuration also changes from `d^5` (which is half filled) and has extra stability. |
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