Which reaction is exothermic? ch4 + 2o2 mc016-1.jpg co2 + 2h2o + 891 kj nh4no3 + h2o + 25 kj mc016-2.jpg nh4+(aq) + no3-(aq) 2h2o + 286 kj mc016-3.jpg 2h2 + o2 n2 + o2 + 181 kj mc016-4.jpg 2no

Option (a) is the correct answer.

Explanation:

Exothermic reactions are the reactions in which heat is released. Whereas when there is absorption of heat then the reaction is known as endothermic reaction.

Thus, out of the given chemical equations, the equation [tex]CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O + 891 KJ shows that energy has been released. Therefore, this reaction equation is exothermic.

wher is the rest of the question