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The d- electron configurations of Mn^(2+...

The d- electron configurations of `Mn^(2+),Fe^(2+),Co^(3+)` and `Ni^(2+)` ard `3d^(5),3d^(6),3d^(6),3d^(8)` , respectively Which of the following aqua complexes will exhibit the minimum paramagnetic behviour ? .

A

`[Fe(H_(2)O)_(6)]^(2+)`

B

`[Co(H_(2)O))_(6)]^(3+)`

C

`[Mn(H_(2)O)_(6)]^(2+)`

D

`[Ni(H_(2)O)_(6)]^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`[Co(H_(2)O)_(6)]^(3+)=d^(2)sp^(3)`
low spin, diamagnetic,magntic moment = zero `BM` .
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Knowledge Check

  • The d-electronic configuration of Cr^(2+), Mn^(2+), Fe^(2+) and Ni^(2+) are, 3^(4), 3d^(5), 3d^(6) and 3d^(8) respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?

    A
    `"["Fe(H_(2)O)_(6)"]"^(2+)`
    B
    `"["Ni(H_(2)O)_(6)"]"^(2+)`
    C
    `"["Cr(H_(2)O)_(6)"]"^(2+)`
    D
    `"["Mn(H_(2))_(6)"]"^(2+)`

  • The d electron configuration of Cr^(2+) , Mn^(2+) , Fe^(2+) and Ni^(2+) aru 3d^(4) , 3d^(5) 3d^(6) and 3d^(8) respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic behaviour? (At. No. Cr= 24, Mn=25, Fe = 26, Ni = 28)

    A
    `[Fe(H_(2)O)_(6)]^(2+)`
    B
    `[Ni(H_(2)O)_(6)]^(2+)`
    C
    `[Cr)H_(2)O)_(6)]^(2+0`
    D
    `[mn(H_(2)O)_(6)]^(2+0`

  • The d electron congfiguration of Cr^(2+) , Mn^(2+) , Fe^(2+) and Ni^(2+) are 3d^(4) , 3d^(5) , 3d^(6) and 3d^(8) respectively. Which one of the folowing aqua complexes will exhibit the minimum paramagnetic behaviour ? (At. No . Cr = 24, Mn = 25, Fe = 26, Ni = 28)

    A
    `[Ni(H_(2)O)_(6)]^(2+)`
    B
    `[Cr(H_(2)O)_(6)]^(2+)`
    C
    `[Mn(H_(2)O)_(6)]^(2+)`
    D
    `[Fe(H_(2)O)_(6)]^(2+)`
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