The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [2025]

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Q.
The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [2025]

${[{Fe (CN)}_{6}]}^{3 -}, {[{FeF}_{6}]}^{3 -}, {[{CoF}_{6}]}^{3 -}, {[{Mn (CN)}_{6}]}^{3 -}$

1 1, 5, 4, 2

2 1, 5, 5, 2

3 1, 1, 4, 2

4 1, 4, 4, 2

Ans.
(1)

Complex Electronic configuration of central metal ion without octahedral splitting Electronic configuration of central ion after octahedral splitting Number of unpaired electrons

${[Fe {(CN)}_{6}]}^{3 -}$ ${Fe}^{3 +} = {}_{18}{[Ar]}$ $3 d^{5}$ $t_{2 g}^{2, 2, 1} e_{g}^{0}$ 1

${[{FeF}_{6}]}^{3 -}$ ${Fe}^{3 +} = {}_{18}{[Ar]}$ $3 d^{5}$ $t_{2 g}^{1, 1, 1} e_{g}^{1, 1}$ 5

${[{CoF}_{6}]}^{3 -}$ ${Co}^{3 +} = {}_{18}{[Ar]}$ $3 d^{6}$ $t_{2 g}^{2, 1, 1} e_{g}^{1, 1}$ 4

${[Mn {(CN)}_{6}]}^{3 -}$ ${Mn}^{3 +} = {}_{18}{[Ar]}$ $3 d^{4}$ $t_{2 g}^{2, 1, 1} e_{g}^{0}$ 2

Solution

Q.
The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [2025]

${[{Fe (CN)}_{6}]}^{3 -}, {[{FeF}_{6}]}^{3 -}, {[{CoF}_{6}]}^{3 -}, {[{Mn (CN)}_{6}]}^{3 -}$

1 1, 5, 4, 2

2 1, 5, 5, 2

3 1, 1, 4, 2

4 1, 4, 4, 2

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Complex	Electronic configuration of central metal ion without octahedral splitting	Electronic configuration of central ion after octahedral splitting	Number of unpaired electrons
${[Fe {(CN)}_{6}]}^{3 -}$	${Fe}^{3 +} = {}_{18}{[Ar]}$ $3 d^{5}$	$t_{2 g}^{2, 2, 1} e_{g}^{0}$	1
${[{FeF}_{6}]}^{3 -}$	${Fe}^{3 +} = {}_{18}{[Ar]}$ $3 d^{5}$	$t_{2 g}^{1, 1, 1} e_{g}^{1, 1}$	5
${[{CoF}_{6}]}^{3 -}$	${Co}^{3 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{2, 1, 1} e_{g}^{1, 1}$	4
${[Mn {(CN)}_{6}]}^{3 -}$	${Mn}^{3 +} = {}_{18}{[Ar]}$ $3 d^{4}$	$t_{2 g}^{2, 1, 1} e_{g}^{0}$	2

Solution

Q. The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [2025] [Fe(CN)6]3-, [FeF6]3-, [CoF6]3-, [Mn(CN)6]3-

1 1, 5, 4, 2

2 1, 5, 5, 2

3 1, 1, 4, 2

4 1, 4, 4, 2

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Q.
The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [2025]

${[{Fe (CN)}_{6}]}^{3 -}, {[{FeF}_{6}]}^{3 -}, {[{CoF}_{6}]}^{3 -}, {[{Mn (CN)}_{6}]}^{3 -}$