The oxygen in the final equation appears as reactant Upper O subscript 2 (g). Thus, option A is correct.
The chemical equations are the representation of the chemical formula involved in the equation as the reactant and the formed product.
<h3>What will be the form of oxygen?</h3>
The given chemical equations are:


The final chemical equation formed for the formation of Carbon dioxide is the sum of the two equations.
The final equation is achieved by substituting equation 1 in equation 2.

The oxygen in the final equation appears as reactant Upper O subscript 2 (g). Thus, option A is correct.
Learn more about the final equation, here:
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Explanation: