Verified Solution • 2025–26 Session moderate

QJEEM24Ch756d: JEE Main 2024 Chemistry - Class 12 JEEM24Ch756d Solution: Number of complexes from the following with even number of…

Number of complexes from the following with even number of unpaired " d\mathrm{d} " electrons is ________ [V(H2O)6]3+,[Cr(H2O)6]2+,[Fe(H2O)6]3+,[Ni(H2O)6]3+,[Cu(H2O)6]2+[\mathrm{V}(\mathrm{H}_2 \mathrm{O})_6]^{3+},[\mathrm{Cr}(\mathrm{H}_2 \mathrm{O})_6]^{2+},[\mathrm{Fe}(\mathrm{H}_2 \mathrm{O})_6]^{3+},[\mathrm{Ni}(\mathrm{H}_2 \mathrm{O})_6]^{3+},[\mathrm{Cu}(\mathrm{H}_2 \mathrm{O})_6]^{2+} [Given atomic numbers: V=23,Cr=24,Fe=26,Ni=28Cu=29\mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Fe}=26, \mathrm{Ni}=28 \mathrm{Cu}=29 ]

Multiple Choice Options

  • A 1
  • B 5
  • C 2
  • D 4

Step-by-Step Verified Solution

[V(H2O)6]3+→2\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} \rightarrow 2 unpaired electrons

[Cr(H2O)6]2+→4\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} \rightarrow 4 unpaired electrons

Above 2 complex have even number of unpaired electrons.

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