1.

The largest oxidation number exhibited by an element depends on its outer eletronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number ?A. `3d^(2)4s^(2)`B. `3d^(3)4s^(2)`C. `3d^(5)4s^(1)`D. `3d^(5)4s^(2)`

Answer» Correct Answer - d
Highest oxidation number of any transition element =(n-1)d electrons + ns electrons. Therefore, large the number of electrons in the 3d-orbitals, higher is the maximum oxidation number
(a) `3d^(1)4s^(2)=3``" "`(b)`3d^(3)4s^(2)=3+2=5`
( c)`3d^(5)4s^(1)=5+1=6`and`" "`(d) `3d^(5)4s^(2)=5+2-7`
Thus, option (d) is correct


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