The calculated magnetic moments (spin only value) for species FeCl42−,CoC2O433− and MnO42− respectively are:

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The calculated magnetic moments (spin only value) for species ${[{FeCl}_{4}]}^{2 -}, {[Co {(C_{2} O_{4})}_{3}]}^{3 -}$ and ${MnO}_{4}^{2 -}$ respectively are:

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5.92, 4.90 and 0 BM

4.90, 0 and 2.83 BM

5.82, 0 and 0 BM

4.90, 0 and 1.73 BM

answer is A.

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Detailed Solution

${(F e C l_{4})}^{2 -}, {(C o {(C_{2} O_{4})}_{3})}^{3 -}, M n O_{4}^{- 2}$

No. of un -Paired electrons 4, 0, 1

4.90, 0, 1.735

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