(a) Define a combination reaction.

(b) Give one example of a combination reaction which is also exothermic.

(c) Give one example of a combination reaction which is also endothermic.

Open in App

Solution

(a)

In combination reactions, two or more substances combine to form a new compound. Only one product is obtained in such reactions. The reactants in such reactions can be elements as well as compounds. The general equation used to represent a combination reaction is:

$A + Z ⟶ A Z$

(b)

Calcium oxide reacts vigorously with water to produce calcium hydroxide.

A large amount of heat is also evolved during this process, which increases the temperature of the system. Hence, the combination of calcium oxide and water is exothermic in nature.

(c)

The high-temperature combination of nitrogen and oxygen to form nitric oxide (NO) is an endothermic reaction.

$N_{2} + O_{2} ⟶ 2 N O - 180.6 k J$

Suggest Corrections

Similar questions

Question 3

Define combination reaction. Give an example of a combination reaction that is also exothermic.

Give one example of an oxidation-reduction reaction which is also :

(a) a combination reaction

(b) a displacement reaction

C + O_{2} \to {CO}_{2} + Heat

2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)

The process of respiration is :

(a) an oxidation reaction which is endothermic

(b) a reduction reaction which is exothermic

(d) an oxidation reaction which is exothermic

Join BYJU'S Learning Program