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JEE Main 20258 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
8 April
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2025 · 8 April · Evening Shift · Chemistry · d and f Block Elements

The correct decreasing order of spin only magnetic moment values...

The correct decreasing order of spin only magnetic moment values (BM)(\mathrm{BM}) of Cu+,Cu2+,Cr2+\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}, \mathrm{Cr}^{2+} and Cr3+\mathrm{Cr}^{3+} ions is :

Options

  1. ACu+>Cu2+>Cr3+>Cr2+\mathrm{Cu}^{+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cr}^{2+}
  2. BCu2+>Cu+>Cr2+>Cr3+\mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+} \gt \mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+}
  3. CCr2+>Cr3+>Cu2+>Cu+\mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+}
  4. DCr3+>Cr2+>Cu+>Cu2+\mathrm{Cr}^{3+} \gt \mathrm{Cr}^{2+} \gt \mathrm{Cu}^{+} \gt \mathrm{Cu}^{2+}

Correct answer

C. Cr2+>Cr3+>Cu2+>Cu+\mathrm{Cr}^{2+} \gt \mathrm{Cr}^{3+} \gt \mathrm{Cu}^{2+} \gt \mathrm{Cu}^{+}

Step-by-step solution

Cu+:[Ar]3 d10\mathrm{Cu}^{+}:[\mathrm{Ar}] 3 \mathrm{~d}^{10}, Spin only magnetic moment =0=0
B.M.
Cu+2:[Ar]3 d9\mathrm{Cu}^{+2}:[\mathrm{Ar}] 3 \mathrm{~d}^9, Spin only magnetic moment =3=\sqrt{3}
B.M.
Cr+2:[Ar]3 d4\mathrm{Cr}^{+2}:[\mathrm{Ar}] 3 \mathrm{~d}^4, Spin only magnetic moment =24=\sqrt{24}
B.M.
Cr+3:[Ar]3 d3\mathrm{Cr}^{+3}:[\mathrm{Ar}] 3 \mathrm{~d}^3, Spin only magnetic moment =15=\sqrt{15}
B.M.
Order of μ\mu : Cr+2>Cr+3>Cu+2>Cu+\mathrm{Cr}^{+2} \gt \mathrm{Cr}^{+3} \gt \mathrm{Cu}^{+2} \gt \mathrm{Cu}^{+}
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