Which of the following have positive value for heat?

مندرجہ ذیل میں سے کون سا گرمی کے لئے مثبت قدر ہے؟

NH3

CO2

None of these

Nitric oxide (NO) has a positive heat of formation because its formation from N₂ and O₂ is endothermic.

In contrast, NH₃, H₂O, and CO₂ have negative heat of formation values.