Which of the following has largest paramagnetism?

[C r (H_{2} O)_{6}]^{3 +}

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

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

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

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Solution

The correct option is D $[F e (H_{2} O)_{6}]^{2 +}$
Water is a weak ligand. So it cannot affect the pairing of electrons in metal ion. Hence the electrons will fill all d orbitals before pairing up.More the number of unpaired electrons, higher is its paramagnetism.
$C r^{3 +} : 3 d^{3} n = 3, F e^{2 +} : 3 d^{6} n = 4, C u^{2 +} : 3 d^{9} n = 1, Z n^{2 +} : 3 d^{10} n = 0$
$n =$ number of unpaired electrons.
$F e^{2 +}$ has maximum number of (four) unpaired electrons. Hence it shown highest paramagnetism.

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Similar questions

Q. Which of the following has highest para-magnetism?

{[Z n {(H_{2} O)}_{4}]}^{2 +}, {[C r {(H_{2} O)}_{6}]}^{3 +}, {[F e {(H_{2} O)}_{6}]}^{3 +}, {[C u {(H_{2} O)}_{4}]}^{2 +}

Amongst the following ions which one has the highest magnetic moment value?

(i) [Cr(H₂O)₆]³⁺

(ii) [Fe(H₂O)₆]²⁺

(iii) [Zn(H₂O)₆]²⁺

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 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 complexes will exhibit the maximum paramagnetic behaviour?

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