(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.

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Solution

(a) The reaction in which a single product is formed from two or more reactants is called a combination reaction.

(b) Carbon burns in air to form carbon dioxide.

C (s) + O₂(g) → CO₂(g)

Heat is released during this reaction.

(c) Nitrogen burns in air to form nitric oxide.

N₂(g) + O₂(g) → 2NO (g)

Heat is absorbed during this reaction.

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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

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