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Among (i) [Co(NH(3))(6)]Cl(3), (ii) [Ni(...

Among `(i) [Co(NH_(3))_(6)]Cl_(3), (ii) [Ni(NH_(3))_(6)]Cl_(2), (iii) [Cr(H_(2)O)_(6)]Cl_(3), (iv) [Fe(H_(2)O)_(6)]Cl_(2)` the complex which is diamagnetic is

A

i

B

ii

C

iii

D

iv

Text Solution

Verified by Experts

The correct Answer is:
A
(i) `Co^(+3)=[Ar]3d^(6) s^(0)`
`NH_(3)` is a strong field ligand

(ii) `Ni^(+2)=[Ar]3d^(8) 4s^(0)`
`NH_(3)` is a strong field ligand

(iii) `Cr^(+3)=[Ar]3d^(3) 4s^(0)`
`H_(2)O` is a weak field ligand

(iv) `Fe^(+2)=[Ar]3d^(6) 4s^(0)`
`H_(2)O` is a weak field ligand.

So, `[Co(NH_(3))_(6)]Cl_(3)` will be diamagnetic.
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