MCQ
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
- ✓$[Ni(NH_3)_6]^{2+}$
- B$[Zn(NH_3)_6]^{2+}$
- C$[Cr(NH_3)_6]^{3+}$
- D$[Co(NH_3)_6]^{3+}$
✓
Answer
Correct option: A.
$[Ni(NH_3)_6]^{2+}$
a
$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}: \mathrm{sp}^{3} \mathrm{d}^{2}$ (outer), octahedral, paramagnetic
$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}: \mathrm{sp}^{3} \mathrm{d}^{2}$ (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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