A) \[(n-1){{d}^{8}},\,\,n{{s}^{2}}\]
B) \[(n-1){{d}^{5}},\,\,n{{s}^{1}}\]
C) \[(n-1){{d}^{3}},\,\,n{{s}^{2}}\]
D) \[(n-1){{d}^{5}},\,\,n{{s}^{2}}\]
Correct Answer: D
Solution :
Maximum oxidation state exhibited by d block elements (O.S) = no. of ns electrons + no. of \[(n-1)d\] electrons. (a)\[O.S.=2+2=4\] (b)\[O.S.=5+1=6\] (c)\[O.S.=3+2=5\] (d)\[O.S.=5+2=7\] \[\therefore \,\,(n-1){{d}^{5}}n{{s}^{2}}\]configuration will achieve the highest oxidation state.
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