The correct decreasing order of spin only magnetic moment values (B.M.) of Cu + , Cu 2 + , Cr 2 + and Cr 3 + ions is : [2025]

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Q.
The correct decreasing order of spin only magnetic moment values (B.M.) of ${Cu}^{+}$ , ${Cu}^{2 +}$ , ${Cr}^{2 +}$ and ${Cr}^{3 +}$ ions is : [2025]

1 ${Cu}^{+} > {Cu}^{2 +} > {Cr}^{3 +} > {Cr}^{2 +}$

2 ${Cu}^{2 +} > {Cu}^{+} > {Cr}^{2 +} > {Cr}^{3 +}$

3 ${Cr}^{2 +} > {Cr}^{3 +} > {Cu}^{2 +} > {Cu}^{+}$

4 ${Cr}^{3 +} > {Cr}^{2 +} > {Cu}^{+} > {Cu}^{2 +}$

Ans.
(3)

Ion Electronic configuration Number of unpaired electrons (n) Spin only magnetic moment ( $μ$ ) $= \sqrt{n (n + 2)}$ BM

${Cu}^{+}$ ${}_{18}{[Ar]}$ $3 d^{10}$ 0 0

${Cu}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{9}$ 1 $\sqrt{1 (1 + 2)} BM = \sqrt{3} BM$

${Cr}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{4}$ 4 $\sqrt{4 (4 + 2)} BM = \sqrt{24} BM$

${Cr}^{3 +}$ ${}_{18}{[Ar]}$ $3 d^{3}$ 3 $\sqrt{3 (3 + 2)} BM = \sqrt{15} BM$

Thus, the decreasing order of spin-only magnetic moment is: ${Cr}^{2 +} > {Cr}^{3 +} > {Cu}^{2 +} > {Cu}^{+}$

Solution

Q.
The correct decreasing order of spin only magnetic moment values (B.M.) of ${Cu}^{+}$ , ${Cu}^{2 +}$ , ${Cr}^{2 +}$ and ${Cr}^{3 +}$ ions is : [2025]

1 ${Cu}^{+} > {Cu}^{2 +} > {Cr}^{3 +} > {Cr}^{2 +}$

2 ${Cu}^{2 +} > {Cu}^{+} > {Cr}^{2 +} > {Cr}^{3 +}$

3 ${Cr}^{2 +} > {Cr}^{3 +} > {Cu}^{2 +} > {Cu}^{+}$

4 ${Cr}^{3 +} > {Cr}^{2 +} > {Cu}^{+} > {Cu}^{2 +}$

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Ion	Electronic configuration	Number of unpaired electrons (n)	Spin only magnetic moment ( $μ$ ) $= \sqrt{n (n + 2)}$ BM
${Cu}^{+}$	${}_{18}{[Ar]}$ $3 d^{10}$	0	0
${Cu}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{9}$	1	$\sqrt{1 (1 + 2)} BM = \sqrt{3} BM$
${Cr}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{4}$	4	$\sqrt{4 (4 + 2)} BM = \sqrt{24} BM$
${Cr}^{3 +}$	${}_{18}{[Ar]}$ $3 d^{3}$	3	$\sqrt{3 (3 + 2)} BM = \sqrt{15} BM$

Solution

Q. The correct decreasing order of spin only magnetic moment values (B.M.) of Cu+, Cu2+, Cr2+ and Cr3+ ions is : [2025]

1 Cu+>Cu2+>Cr3+>Cr2+

2 Cu2+>Cu+>Cr2+>Cr3+

3 Cr2+>Cr3+>Cu2+>Cu+

4 Cr3+>Cr2+>Cu+>Cu2+

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Q.
The correct decreasing order of spin only magnetic moment values (B.M.) of ${Cu}^{+}$ , ${Cu}^{2 +}$ , ${Cr}^{2 +}$ and ${Cr}^{3 +}$ ions is : [2025]

1 ${Cu}^{+} > {Cu}^{2 +} > {Cr}^{3 +} > {Cr}^{2 +}$

2 ${Cu}^{2 +} > {Cu}^{+} > {Cr}^{2 +} > {Cr}^{3 +}$

3 ${Cr}^{2 +} > {Cr}^{3 +} > {Cu}^{2 +} > {Cu}^{+}$

4 ${Cr}^{3 +} > {Cr}^{2 +} > {Cu}^{+} > {Cu}^{2 +}$