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BITSAT 2021
Exam
BITSAT
Year
2021
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

BITSAT 2021 · Chemistry · Chemical Bonding and Molecular Structure

Which one of the following ions has the maximum magnetic moment?

Which one of the following ions has the maximum magnetic moment?

Options

  1. ASc3+\mathrm{Sc}^{3+}
  2. BTi3+\mathrm{Ti}^{3+}
  3. CCr3+\mathrm{Cr}^{3+}
  4. DFe3+\mathrm{Fe}^{3+}

Correct answer

D. Fe3+\mathrm{Fe}^{3+}

Step-by-step solution

Fe3+\mathrm{Fe}^{3+}\left(d^{5}\right)has5unpairedelectronsthereforemagneticmoment=n(n+2)=5(5+2)=5.91has 5 unpaired electrons therefore magneticmoment =\sqrt{n(n+2)}=\sqrt{5(5+2)}=5.91 which is maximum among given options. As \mathrm{Sc}^{3+}, \mathrm{Ti}^{3+}, \mathrm{Cr}^{3+}andV3+containand \mathrm{V}^{3+} contain0,1,3, and 2 number of unpaired electrons respectively.
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