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The atomic number of $\text {Mn, Fe, Co and Ni}$ are 25, 26 27 and 28 respectively. Which of the following outer orbital octahedral complexes have the same number of unpaired electrons?

(i) $\left [ MnCl_{6} \right ]^{3-}$

(ii) $\left [ FeF_{6} \right ]^{3-}$

(iii) $\left [ CoF_{6} \right ]^{3-}$

(iv) $\left [ Ni(NH_{3})_{6} \right ]^{2+}$

Answers (1)

Option (i) and (iii) are the correct answer.

Explanation :

(a,c)

$[MnCl_{6}]^{3-}: Mn^{3+}(3d^{4})$

$[CoF_{6}]^{3-}: Co^{3+}(3d^{6})$

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