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The correct decreasing order of spin only magnetic moment values (BM) of \({\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+}{\mathrm{…

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The correct decreasing order of spin only magnetic moment values (BM) of \({\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+}{\mathrm{Cr}}^{2+}\) and \({\mathrm{Cr}}^{3+}\) ions is :

[JEE Main 2025, 8 Apr (Shift 1)]

a

\({\mathrm{Cu}}^{+}>{\mathrm{Cu}}^{2+}>{\mathrm{Cr}}^{3+}>{\mathrm{Cr}}^{2+}\)

b

\({\mathrm{Cu}}^{2+}>{\mathrm{Cu}}^{+}>{\mathrm{Cr}}^{2+}>{\mathrm{Cr}}^{3+}\)

c

\({\mathrm{Cr}}^{2+}>{\mathrm{Cr}}^{3+}>{\mathrm{Cu}}^{2+}>{\mathrm{Cu}}^{+}\)

d

\({\mathrm{Cr}}^{3+}>{\mathrm{Cr}}^{2+}>{\mathrm{Cu}}^{+}>{\mathrm{Cu}}^{2+}\)

✓ Correct answer: c)

\({\mathrm{Cr}}^{2+}>{\mathrm{Cr}}^{3+}>{\mathrm{Cu}}^{2+}>{\mathrm{Cu}}^{+}\)

Explanation

Cu+ : [Ar] 3d10 , Spin only magnetic moment = 0 B.M.
Cu+2 : [Ar] 3d9 ,Spin only magnetic moment = 1.73 B.M.
Cr+2 : [Ar] 3d4 ,Spin only magnetic moment = 4.90 B.M.
Cr+3 : [Ar] 3d3 ,Spin only magnetic moment = 3.87 B.M.
Order of µ : Cr+2 > Cr+3 > Cu+2 > Cu+

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