Oxidation number

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

The sum of all oxidation numbers in a neutral compound is ___.

• 0
• 1
• -1
• depends on the compound

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

What is oxidation number of P in K₃PO₄?

• +1
• +5
• -2
• 0