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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
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 ..... .
  • A
    $5.82,0$ and $0\, BM$
  • ✓
    $4.90,0$ and $1.73\, BM$
  • C
    $5.92,4.90$ and $0 \,BM$
  • D
    $4.90,0$ and $2.83 \,BM$
✓

Answer

Correct option: B.
$4.90,0$ and $1.73\, BM$
b
$(i)$ $\left[ FeCl _{4}\right]^{-2}$

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

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

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

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

$\mu=0$

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

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

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

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

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