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