Question

The formation of water from $H_2\left(g\right)$ and $O_2\left(g\right)$ is an exothermic process because:

• A. the chemical energy of $H_2\left(g\right)$ and $O_2\left(g\right)$ is more than that of water
• B. the chemical energy of $H_2\left(g\right)$ and $O_2\left(g\right)$ is less than that of water
• C. the temperature of $H_2\left(g\right)$ and $O_2\left(g\right)$ is higher than that of water
• D. the temperature of $H_2\left(g\right)$ and $O_2\left(g\right)$ is lower than that of water

Answer 1

The correct option is A the chemical energy of $H_2\left(g\right)$ and $O_2\left(g\right)$ is more than that of water

Exothermic reaction is a reaction in which net energy is released in a reaction.
i.e, $\Delta H=\text{(energy of products) -( energy of reactants)}<0$
=> $\text{(energy of products) < (energy of reactants)}$
Hence, chemical energy of reactants $\left(H_2\right(g\left)\text{and}{O}_2\right(g\left)\right)$ is more than that of the product $\left(H_{2}O\right)$
Hence, answer is option $A$.