Question

For the coordination complex ion [Co(NH₃)₆] ³⁺

(i) Give the IUPAC name of the complexion.

(ii) What is the oxidation number of cobalt in the complexion?

(iii) State the type of hybridisation of the complexion.

(iv) State the magnetic behaviour of the complexion.

Answer 1

(i) hexaamminecobalt (II) ions

(ii) x + 6(0) = +3

x = +3

No. of Co in complex ion = +3

(iii) d²sp³

(iv) [CO(NH₃)₆] ³⁺

Co³⁺ has no unpaired electron.

Hence, [Co(NH₃)₂]³⁺ is diamagnetic.