The d-electron configurations of $C r^{2 +}, M n^{2 +}, F e^{2 +}$ and $C o^{2 +}$ are $d^{4}, d^{5}, d^{6}$ and $d^{^{7}}$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?
(Atomic numbers of Cr $= 24, M n = 25, F e = 26, C o = 27)$

[M n (H_{2} O)_{6}]^{2 +}

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[F e (H_{2} O)_{6}]^{2 +}

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[C o (H_{2} O)_{6}]^{2 +}

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[C r (H_{2} O)_{6}]^{2 +}

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Solution

The correct option is C $[C o (H_{2} O)_{6}]^{2 +}$
As magnetic moment is $\sqrt{n (n + 2)}$ where n is no. of unpair electron.

So ion with minimum no. of unpair electron will have minimum paramagnetism.

$= [C o (H_{2} O)_{6}]^{2 +}$ have minimum paramagnetic behaviour.

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Similar questions

Q. The d-electron configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +} are d^{4}, d^{5}, d^{6} and d^{7}

respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?

(At, nos.

C r = 24, M n = 25, F e = 26, C o - 27

)

Q. The d-electron configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}

are

d^{4}

d^{5}

d^{6}

and

d^{7}

respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)

Q. The

d -

electronic configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +}

and

N i^{2 +}

are

3 d^{4}, 3 d^{5}, 3 d^{6}

and

3 d^{8}

respectively, which one of the following aqua-complex will exhibit the minimum paramagnetic behaviour?

The d - electron configurations of $M n^{2 +}, F e^{2 +}, C o^{3 +}, a n d N i^{2 +} a r e 3 d^{5}, 3 d^{6}, 3 d^{6}, 3 d^{8},$ respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?

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The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4,d5,d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour ? (Atomic numbers of Cr=24,Mn=25,Fe=26,Co=27)

The correct option is C [Co(H2O)6]2+As magnetic moment is √n(n+2) where n is no. of unpair electron.So ion with minimum no. of unpair electron will have minimum paramagnetism.=[Co(H2O)6]2+ have minimum paramagnetic behaviour.

The d-electron configurations of $C r^{2 +}, M n^{2 +}, F e^{2 +}$ and $C o^{2 +}$ are $d^{4}, d^{5}, d^{6}$ and $d^{^{7}}$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour ?
(Atomic numbers of Cr $= 24, M n = 25, F e = 26, C o = 27)$

The correct option is C $[C o (H_{2} O)_{6}]^{2 +}$
As magnetic moment is $\sqrt{n (n + 2)}$ where n is no. of unpair electron.

So ion with minimum no. of unpair electron will have minimum paramagnetism.

$= [C o (H_{2} O)_{6}]^{2 +}$ have minimum paramagnetic behaviour.