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JEE Main 20245 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
5 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2024 · 5 April · Morning Shift · Chemistry · Coordination Compounds

Which one of the following complexes will exhibit the least...

Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, (Cr=\mathrm{Cr}=24, Mn=\mathrm{Mn}=25, Fe=\mathrm{Fe}=26, Co=\mathrm{Co}=27) ]

Options

  1. A(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+})
  2. B(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+})
  3. C(\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+})
  4. D(\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+})

Correct answer

C. (\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+})

Step-by-step solution

<tableclass="qx−match−listqx−match−table"border="1"cellpadding="6"cellspacing="0"><tr><td><table class="qx-match-list qx-match-table" border="1" cellpadding="6" cellspacing="0"><tr><td>Numberofunpairede\begin{array}{l} Number of unpaired e \end{array}\mu=\sqrt{n(n+2)} B.M.\left[Co\left(H_2 O\right)_6\right]^{2+}</td><td>3</td><td>3.87</td></tr><tr><td>[Fe(H2O)6]2+</td><td>3</td><td>3.87</td></tr><tr><td>\left[Fe\left(H_2 O\right)_6\right]^{2+}44.89\left[Mn\left(H_2 O\right)_6\right]^{2+}</td><td>5</td><td>5.92</td></tr><tr><td>[Cr(H2O)6]2+</td><td>5</td><td>5.92</td></tr><tr><td>\left[Cr\left(H_2 O\right)_6\right]^{2+}44.89 Least paramagnetic behaviour=\left[\mathrm{Co}\left(\mathrm{H}_2\mathrm{O}\right)_6\right]^{2+}
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