Question

The formation of nitric oxide from Nitrogen and Oxygen is endothermic in nature. What will be the sign of $\Delta H$?

• A. $\Delta H$ is positive
• B. $\Delta H$ is negative
• C. $\Delta H$ is zero
• D. None of these

Answer 1

The correct option is A $\Delta H$ is positive

$N_2$ $+$ $O_2$ $+$ $Heat$ $=$ $2NO$
Almost $181kJ$ of heat is absorbed during the reaction of Nitrogen and Oxygen to produce nitric oxide. Since heat is absorbed, the reaction is endothermic in nature. So, the value of $\Delta H$ will be positive.