Amongst `[Co(o x)_3]^(3-) , [CoF_6]^(3-)` and `[Co(NH_3)_6]^(3+)`:

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Q 2782378237.     Amongst `[Co(o x)_3]^(3-) , [CoF_6]^(3-)` and `[Co(NH_3)_6]^(3+)`:

A

`[Co(o x)_3]^(3-)` and `[CoF_6]^(3-)` are paramagnetic and `[Co(NH_3)_6]^(3+)` is diamagnetic.

B

`[Co(o x)_3]^(3-)` and `[Co(NH_3 )_6]^(3+)` are paramagnetic and `[CoF_6]^(3-)` is diamagnetic.

C

`[Co(o x)_3]^(3-)` and `[Co(NH_3 )_6 ]^(3+)` are diamagnetic and `[CoF_6]^(3-)` is paramagnetic.

D

`[Co(NH_3 )_ 6]^(3+)` and `[CoF_6]^(3-)` are paramagnetic and `[Co(o x)_3]^(3-)` is diamagnetic.

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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