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Atomic number of Mn, \( \mathrm{Fe} \) and \( \mathrm{Co} \) are 25,26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?
(i) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
(ii) \( \left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-} \)
P
(iii) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4} \)
(iv) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right)^{3-} \)
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