9. Mangnesium can form compounds by acting with different oxidation numbers (2-, 3+, 4+, 6+, 7+). Argue your answer.

a) Which of the following species can act as oxidizing agents?

b) Which ones as reducing agents?

a) Mn2 +

b) MnO2

c) MnO-4

d) NnO2-4

e) Mn (OH) 2