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  4. The calculated magnetic moments (spin only value) for species [ FeCl 4]2-,[ Co ( C 2 O 4)3]3- and MnO 42- respectively are

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Q. The calculated magnetic moments (spin only value) for species $\left[ FeCl _{4}\right]^{2-},\left[ Co \left( C _{2} O _{4}\right)_{3}\right]^{3-}$ and $MnO _{4}^{2-}$ respectively are

JEE MainJEE Main 2021Coordination Compounds

Solution:

(i)$\left[ FeCl _{4}\right]^{-2} \Rightarrow $image

$\mu =\sqrt{ n ( n +2)} BM$

$=\sqrt{4(4+2)} BM$

$=\sqrt{24} BM \Rightarrow 4.90 BM$

(ii) $\left[ Co \left( C _{2} O _{4}\right)_{3}\right]^{-3}$

image

$\mu=0$

(iii) $MnO _{4}^{-2}$

$Mn ^{+6} \Rightarrow [ Ar ] 3 d ^{1},\,\,\, \mu=\sqrt{ n ( n +2)} BM$

$=\sqrt{1(1+2)} BM$

$=\sqrt{3} BM \Rightarrow 1.73 BM$