Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option. [Atomic Number: Fe = 26, Mn = 25, Co = 27 ] List I List II P t _ 2g ^ 6 e _ g ^ 0 1 [Fe ( H _ 2

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Quantrex Academy · Accepted Answer

Correct answer: D. P → 3; Q → 2; R → 4; S → 1

In the complex [Fe ( H _ 2 O) _ 6 ] ^ 2 + the electronic configuration of Fe ^ 2 + is [Ar]3 d ^ 6 . H _ 2 O is a weak ligand. Hence, the crystal filed splitting can be shown as follows, In the complex [Mn ( H _ 2 O) _ 6 ] ^ 2 + the electronic configuration of Mn ^ 2 + is [Ar]3 d ^ 5 . H _ 2 O is a weak ligand. Hence, the crystal filed splitting can be shown as follows, In the complex [Co ( NH _ 3 ) _ 6 ] ^ 3 + the electronic configuration of Fe ^ 3 + is [Ar]3 d ^ 6 . NH _ 3 is a strong filed ligand. Hence, the crystal filed splitting can be shown as follows, In the complex [ FeCl _ 4 ] ^ - the electronic configuration of Fe ^ 3 + is [Ar]3 d ^ 5 . Cl ^ - is a weak ligand. Hence, the crystal filed splitting can be shown as follows, In the complex [ CoCl _ 4 ] ^ 2 - the electronic configuration of Co ^ 2 + is [Ar]3 d ^ 7 . Cl ^ - is a weak ligand. Hence, the crystal filed splitting can be shown as follows,

	List I		List II
$P$	${t}_{2g}^{6}{e}_{g}^{0}$	$1$	${\left[Fe{\left({H}_{2}O\right)}_{6}\right]}^{2 +}$
$Q$	${t}_{2g}^{3}{e}_{g}^{2}$	$2$	${\left[Mn{\left({H}_{2}O\right)}_{6}\right]}^{2 +}$
$R$	${e}^{2}{t}_{2}^{3}$	$3$	${\left[Co{\left({NH}_{3}\right)}_{6}\right]}^{3 +}$
$S$	${t}_{2g}^{4}{e}_{g}^{2}$	$4$	${\left[{FeCl}_{4}\right]}^{-}$
		$5$	${\left[{CoCl}_{4}\right]}^{2 -}$

Match the electronic configurations in List-I with appropriate...

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