Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

  • Option 1)

    [Ni(NH3)6]2+

  • Option 2)

    [Zn(NH3)6]2+

  • Option 3)

    [Cr(NH3)6]3+

  • Option 4)

    [Co(NH3)6]3+

 

Answers (1)

As we discussed in the concept

NH_3  is a border line ligand which can work as weak field as well  as strong field ligand. With Ni^{2+} , NH_3 work as weak field ligand that's why it is unable to pair the unpaired electrons of Ni^{2+} which results outer orbital complex with paramagnetic character.


Option 1)

[Ni(NH3)6]2+

Correct

Option 2)

[Zn(NH3)6]2+

Incorrect

Option 3)

[Cr(NH3)6]3+

Incorrect

Option 4)

[Co(NH3)6]3+

Incorrect

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