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Among the following series of transition...

Among the following series of transition metal ions the one where all meal ions have `3d^2` electronic configuration is

A

`Ti^(2+), V^(3+), Cr^(4+), Mn^(5+)`

B

`Ti^(3+), V^(2+), Cr^(3+), Mn^(4+)`

C

`Ti^(+), V^(4+), Cr^(6+), Mn^(7+)`

D

`Ti^(4+), V^(3+), Cr^(2+), Mn^(3+)`

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