Which of the following statements is correct about `[Co(H_(2)O)_(6)]^(2+)` complex ?

Options

A. Electronic configuration = `3d^(7) to t_(2 g)^(5) e_(g)^(2)` ,
no. of unpaired electrons = `3, mu = 3.87 B.M`
B. Electronic configuration = `3d^(6) to t_(2g)^(4) e_(g)^(2)` .
no. of unpaired electrons = 2 , `mu = 2.87 B.M`
C. Electronic configuration = `3d^(7) to t_(2g)^(6) e_(g)^(1)` .
no. of unpaired electrons = 1 , `mu = 2.87 B.M`
D. Electronic configuration = `3d^(7) to t_(2g)^(3) e_(g)^(4)` .
no. of unpaired electrons = 3 , `mu = 3.87 B.M`

Answer

A

Explanation

In `[Co(H_(2)_(6)]^(2+)` , oxidation state of `Co = +2 , Co^(2+) = 3d^(7)`

`mu = sqrt(n(n+2)) = sqrt(3(3 + 2)) = sqrt(15) = 3.87` B.M.