What coefficients are required to balance the following equation?
$F e + O_{2} \to F e O$

2, 1, 2

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1, 1, 1

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4, 2, 4

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2, 1, 1

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Solution

The correct option is A $2, 1, 2$
Left side Oxygen is $2$ but right side only $1$ . Balance Oxygen by putting $2$ before $F e O .$
$F e + O_{2} ⟶ 2 F e O$
But, $F e$ on right side is $2$ now, but left side only $1$ . Balance $F e$ by writing $2$ before $F e$ .
$2 F e + O_{2} ⟶ 2 F e O$
Total reaction balanced . So, coefficient are $2, 1, 2$ .

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