Amongst the following ions which one has the highest magnetic moment value?
(i) $[C r (H_{2} O)_{6}]^{3 +}$ (ii) $[F e (H_{2} O)_{6}]^{2 +}$ (iii) $[Z n (H_{2} O)_{6}]^{2 +}$

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Solution

(i) $[C r (H_{2} O)_{6}]^{3 +} : 3 d^{3} :$ 3 unpaired electrons
(ii) $[F e (H_{2} O)_{6}]^{2 +} : 3 d^{6} :$ 4 unpaired electrons. has maximum magnetic moment.
(iii) $[Z n (H_{2} O)_{6}]^{2 +} : 3 d^{10} :$ 0 unpaired electrons and is diamagnetic.

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Similar questions

{[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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