Question

Which of the following is example of endothermic reaction ?
1.Burning of methane in air
2. Reaction of quick lime with water 3.Nitrogen reacts with oxygen to form NO 4.Nitrogen reacts with hydrogen to form ammonia​

Answer 1

Explanation:

The combustion of methane or octane is exothermic; it releases energy.

 CH4 + 2 O2 → CO2 + 2 H2O + energy

The energies of the products are lower than the energiies of the reactants.

Answer 2

Answer:

4. the formation of NO is an endothermic reaction.

Explanation:

the N2 and O2 molecules need to break before the firm NO molecules, so this need energy, that's why it is an endothermic reaction.