Chemistry
Grade-9
Easy
Question
The formula of iron(III) oxide is:
- FeO
- FeO2
- Fe2O
- Fe2O3
Hint:
Iron is present in +3 oxidation state.
The correct answer is: Fe2O3
- When a metal can have multiple oxidation states, the particular oxidation state in which it exists in that compound in mentioned in binary in the bracket.
- In the chemical name in binary the oxidation state of the metal is mentioned.
- Iron is in +3 oxidation state and oxide in -2. To balance out and to make the compound neutral two iron atoms and three oxygen atoms are present.
- The chemical formula of iron(III) oxide is Fe2O3.
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