Answer:
Oxide of manganese, Potassium permanganate, Manganese bromide and manganese oxide.
Explanation:
1. Manganese dioxide
Its chemical formula is [tex]$MnO_2$[/tex]. It is +4 oxidation state. It is a black solid which is fairly stable.
2. Potassium permanganate
Its chemical formula is [tex]$KMnO_4$[/tex]. It is commonly used in the laboratories as oxidizing agent. They appear black in color.
3 Manganese bromide
Its chemical formula is [tex]$MnBr_2$[/tex]
4. Oxides of manganese
Chemical formula is [tex]$Mn_3O_4$[/tex]
The most stable state of Manganese is +2 oxidation state.