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⁺

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Solution

(i) No. of unpaired electrons in [Cr(H₂O)₆]³⁺ = 3

Then, μ

(ii) No. of unpaired electrons in [Fe(H₂O)₆]²⁺ = 4

Then, μ

(iii) No. of unpaired electrons in [Zn(H₂O)₆]²⁺ = 0

Hence, [Fe(H₂O)₆]²⁺has the highest magnetic moment value.

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{[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 +}

C o = 27, N i = 28]

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

The pair having the same magnetic moment is :
[At. No.: Cr=24, Mn=25, Fe=26, Co=27]

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