Oxidation Number

What is the oxidation number of N in NO₂^- ?

• -3

• +4

• -2

• +3

What is the oxidation number of Fe in FeO?

• +1

• -1

• +2

• -2

What is the oxidation number of O in CO₂?

• +2
• -1
• +4
• -2

What is the oxidation number of N in NO₃^- ?

• -3

• +5

• -2

• +3

If an atom gains O during a chemical reaction, the atom was:

• Oxidized

• Reduced

• Neutralized

• Precipitated

What is the oxidation of C in CH₄?

• -4
• -1
• +4
• +1

What is oxidation number of Mn in MnO₂ ?

• 0
• +2
• -2
• +4

What is the oxidation number of Ca in Ca₃N₂?

• +3
• +2
• -3
• -2

What is the oxidation number of S in SO₄ ^2-  ?

• -2
• +2
• +6
• -4

What is oxidation number of Cr in
Cr₂O₇^2-?

• -2
• +2
• +6
• +12