The d electronic configurations of Cr 2+ , Mn 2+ , Fe 2+ and Ni 2+ are 3d 4 , 3d 5 , 3d 6…

Chemistry · JEE Advanced · NTA ExamsCoordination Compounds

The d electronic configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
  1. \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)
  2. \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)
  3. \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\)
  4. \(\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) 
    (At. No. Cr-24, Mn-25, Fe-26, Ni = 28)

Answer

(B) [ Ni ( H _ 2 O )_ 6 ]^ 2+

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