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BITSAT 2024Paper 1
Exam
BITSAT
Year
2024
Paper
Paper 1
Subject
Chemistry
Chapter
Coordination Compounds

BITSAT 2024 · Paper 1 · Chemistry · Coordination Compounds

Which of the following complexes will exhibit maximum attraction to...

Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

Options

  1. A\left[\mathrm{Zn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
  2. B\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
  3. C[Co(en)3]3+\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}
  4. D\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}

Correct answer

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

Step-by-step solution

Complex with maximum number of unpaired electron will exhibit maximum attraction to an applied magnetic field. [Zn(H2O)6]2+→\mathrmd10\left[\mathrm{Zn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow \mathrmd^{10} system →t2 g6eg4\rightarrow \mathrm{t}_{2 \mathrm{~g}}^6 \mathrm{e}_{\mathrm{g}}^4 0 unpaired \mathrme−[Co(H2O)6]2+→d7\mathrme^{-}\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow \mathrm{d}^7 system →t2 g5eg2\rightarrow \mathrm{t}_{2 \mathrm{~g}}^{5} \mathrm{e}_{\mathrm{g}}^2 3 unpaired \mathrme−[Co(en)3]3+→d6\mathrme^{-}\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+} \rightarrow \mathrm{d}^6 system →t2 g6eg0\rightarrow \mathrm{t}_{2 \mathrm{~g}}^6 \mathrm{e}_{\mathrm{g}}^0 0 unpaired \mathrme−[Ni(H2O)6]2+→d8\mathrme^{-}\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow \mathrm{d}^8 system →t2 g6eg2\rightarrow \mathrm{t}_{2 \mathrm{~g}}^{6} \mathrm{e}_{\mathrm{g}}^2 2 unpaired e
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