Answer:
Option C = only Fe is unbalanced.
Explanation:
Chemical equation:
Fe₂O₃ + 3CO  → Fe + 3CO₂
The chemical equation is incorrectly balanced because,
There are two iron atoms on the left side of equation while only one iron atom on right side of equation.
The oxygen and carbon atoms both are balanced. There are six oxygen and three carbon atoms are present on both side of equation.
Correct balanced equation:
Fe₂O₃ + 3CO  → 2Fe + 3CO₂
This equation is correctly balanced. There are two iron, six oxygen and three carbon atoms are present on both side of equation.
So equation is correctly balanced.
