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Atomic number of \( \mathrm{Mn}, \mathrm{Fe}, \mathrm{Co} \) and Ni are 25,2627 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?
(i) \( \left[\mathrm{MnCl}_{6}\right]^{3-} \)
(ii) \( \left[\mathrm{FeF}_{6}\right]^{3-} \)
(iii) \( \left[\mathrm{CoF}_{6}\right]^{3-} \)
(iv) \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
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