Question 1
The ion [Co(NH
3)
6]
2+ is octahedral and high spin. This complex is
◦ paramagnetic, with 1 unpaired electron.
◦ paramagnetic, with 3 unpaired electrons.
◦ paramagnetic, with 4 unpaired electrons.
◦ paramagnetic, with 5 unpaired electrons.
◦ diamagnetic.
Question 2
The number of geometrical isomers and optical isomers of the complex ion [Co(en)
3]
3+ are, respectively,
◦ 2 and 2.
◦ 1 and 1.
◦ 3 and 2.
◦ 1 and 2.
◦ 2 and 4.