Match List - I with List - II. List-I List-II (a) ${[\mathrm{Fe}{(\mathrm{CN})}_{6}]}^{3-}$ (i) $5.92\mathrm{BM}$ (b) ${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}$ (ii) $0\mathrm{BM}$ (c) ${[\mathrm{Fe}{(\mathrm{CN})}_{6}]}^{4-}$ (iii) $4.90\mathrm{BM}$ (d) ${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$ (iv) $1.73\mathrm{BM}$ Choose the correct answer from the options given below.

NEET UG 2021 — Chemistry Inorganic Chemistry

2021mcqeasy

Match List - I with List - II.

List-I		List-II
(a)	${[\mathrm{Fe}{(\mathrm{CN})}_{6}]}^{3-}$	(i)	$5.92\mathrm{BM}$
(b)	${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}$	(ii)	$0\mathrm{BM}$
(c)	${[\mathrm{Fe}{(\mathrm{CN})}_{6}]}^{4-}$	(iii)	$4.90\mathrm{BM}$
(d)	${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$	(iv)	$1.73\mathrm{BM}$

Choose the correct answer from the options given below.

Official previous-year question

Held on 30 Apr 2021 · Verified 9 Jul 2026.

Options

A
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
B
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
C
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
D
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

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Solution

${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{3-}$ has ${\mathrm{Fe}}^{3+}$ central ion $({d}^{5})$

Electronic configuration (SFL)

${t}_{2g}{eg2,2,1}^{0,0}$

$n=1$

Magnetic moment:

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

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

$=\sqrt{3}$

$=1.73\mathrm{BM}$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}:$ has ${d}^{5}$ electrons.

Electronic configuration (WFL)

${t}_{2g}{e1,1,1}_{g}^{1,1}$

$n=5$

$\mu =\sqrt{5(5+2)}=\sqrt{35}$

$=5.92B.M.$

${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{4-}$ has ${d}^{6}$ electrons.

Electronic configuration (SFL)

${t}_{2g}^{2,2,1}{e}_{g}^{0,0}$

$n=0$

$\mu =0B.M.$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$ has ${d}^{6}$ electron

Electronic configuration: (WFL)

${t}_{2g}^{2,2,1}{e}_{g}^{1,1}$

$n=4$

$\mu =\sqrt{4(4+2)}=4.90B.M.$

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Solution

${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{3-}$ has ${\mathrm{Fe}}^{3+}$ central ion $({d}^{5})$

Electronic configuration (SFL)

${t}_{2g}{eg2,2,1}^{0,0}$

$n=1$

Magnetic moment:

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

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

$=\sqrt{3}$

$=1.73\mathrm{BM}$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}:$ has ${d}^{5}$ electrons.

Electronic configuration (WFL)

${t}_{2g}{e1,1,1}_{g}^{1,1}$

$n=5$

$\mu =\sqrt{5(5+2)}=\sqrt{35}$

$=5.92B.M.$

${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{4-}$ has ${d}^{6}$ electrons.

Electronic configuration (SFL)

${t}_{2g}^{2,2,1}{e}_{g}^{0,0}$

$n=0$

$\mu =0B.M.$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$ has ${d}^{6}$ electron

Electronic configuration: (WFL)

${t}_{2g}^{2,2,1}{e}_{g}^{1,1}$

$n=4$

$\mu =\sqrt{4(4+2)}=4.90B.M.$

NEET UG 2021 — Chemistry Inorganic Chemistry

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NEET UG 2021 — Chemistry Inorganic Chemistry

Options

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Solution

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NEET UG Inorganic Chemistry in other years

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Physical Chemistry

Organic Chemistry

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