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In the following questions two or more o...

In the following questions two or more options may be correct. Atomic number of Mn, Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic ?

A

`[Co(NH_3)_6]^(3+)`

B

`[Mn(CN)_6]^(3-)`

C

`[Fe(CN)_6]^(4-)`

D

`[Fe(CN)_6]^(3-)`

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