Question

Q. 9 Predict the endothermic
reaction among the following:
(a) N2 + 02 - 2NO
(b) C + 02 - CO2
(C) 2Mg + 02 - 2Mgo
(d) Cao + H20 - Ca(OH)2​

Answer 1

Answer:

The first reaction,i.e.,

(a) N₂+O₂→2NO is an endothermic reaction.

Whereas, (b), and, (c) are exothermic combustion reactions, and (d) is an another exothermic reaction of quicklime with water.

Explanation:

The triple bond between two N atoms in N₂ is very strong due to small size and thus has a high dissociation energy. Due to this a large amount of energy is required to break this bond and thus the oxidation of N₂ is endothermic

Answer 2

Answer:

(a) is right answer

N2+02-2NO