The sum of all the coefficients of reactant and product molecules in the equation is:
$H_{2} O$ + $F e$ $\to$ $F e_{3} O_{4}$ + $H_{2}$

11

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12

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10

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9

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Solution

The correct option is B $12$
The balanced chemical reaction can be written as:
$4 H_{2} O + 3 F e \to {F e}_{3} O_{4} + 4 H_{2}$
Sum of all coefficients = 4+3+1+4 = 12

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