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Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
(a) \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
(b) \( \left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
(AIPMT 2012)
\( \mathrm{P} \)
(c) \( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
(d) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
W
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