Given below are two statements : In the light of the above statements, choose the correct answer from the options given below:
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
Answer
(1) Both Statement I and Statement II are true
Solution
Co3+: 3d6; both complexes have six ligands, so both are octahedral.
[Co(NH3)6]3+: NH3 is a strong field ligand; pairing gives t2g6eg0 (d2sp3, inner orbital), no unpaired electron diamagnetic.
[CoF6]3-: F- is a weak field ligand; t2g4eg2 (sp3d2, outer orbital), 4 unpaired electrons paramagnetic.
So the two differ in magnetic behaviour: Statement I is true and Statement II is true.
Answer: (1)