Consider the complex ion [CO(NH3)6]3+. Which response contains all of the following statements that are true, and no false statements?

I. It is paramagnetic.
II. It is a high spin complex.
III. It is a low spin complex.
IV. It has octahedral geometry.
V. It does not exist as geometric isomers.

a. III, IV, and V
b. II, IV, and V
c. land II
d. land IV
e. III and IV

III, IV, and V

Explanation:

The complex [CO(NH3)6]3+ is a diamagnetic complex. It a low spin d^6 complex. Most d^6 complexes are low spin due to the higher crystal field stabilization energy of the low spin over the high spin arrangement.

d^6 metal complexes are known to be octahedral (a coordination number of 6 leads to octahedral geometry). Octahedral complexes does not have geometric isomers rather, may exist as the fac or her stereo isomers.