A) +2, +3, +4, +5
B) +2, +3, +4, +5, +6
C) +2, +3, +4
D) +2, +3
Correct Answer: A
Solution :
Most of transition methods show variable valences or different oxidation states because of incomplete c/-subshell. The variable oxidation states are due to the participation of ns and (n -1) d electrons in bonding, \[_{23}V\] shows + 2, + 3, + 4, and + 5 oxidation states\[_{27}Co\] shows +2 + 3+ 4 oxidation states. Therefore, known oxidation states for both V and Co are +2 , +3, +4 and+5
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