$a F e + b O_{2} \to c F e_{2} O_{3}$
For the above equation to represent a balanced equation, ratio of a, b and c respectively should be?

4:3:3

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2:3:4

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4:3:2

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4:1:3

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Solution

The correct option is C
4:3:2

$4 F e + 3 O_{2} \to 2 F e_{2} O_{3}$
By balancing the number of atoms on both sides (reactant and product) of each element (Iron and Oxygen), we get a balanced equation: $4 F e + 3 O_{2} \to 2 F e_{2} O_{3}$ Which gives us ratio of a:b:c as 4:3:2.

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