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Question
Q157) Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [AIPMT (Prelims)-2009]
a) 3d
5
, 4s
1
b) 3d
5
, 4s
2
c) 3d
2
, 4s
2
d) 3d
3
, 4s
2
SOLUTION
Answer:(b)