નીચેનામાંથી કોણ બાહ્ય કક્ષક સંકીર્ણ છે, તેમજ અનુચુંબકીય વર્તણૂંક ધરાવે છે?

Question

AIPMT 2012, Diffcult

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Solution

a
$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}: \mathrm{sp}^{3} \mathrm{d}^{2}$ (outer), octahedral, paramagnetic

$\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}: \mathrm{sp}^{3} \mathrm{d}^{2}$ (outer), octahedral, diamagnetic

$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}: \mathrm{d}^{2} \mathrm{sp}^{3}$ (inner), octahedral, paramagnetic

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}: \mathrm{d}^{2} \mathrm{sp}^{3}$ (inner). octahedral, diamagnetic

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