Define a combination reaction. Give one example of a combination reaction which is also exothermic. [2 MARKS]

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Solution

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1. Reactions in which two or more substances combine to form a new compound are called combination reactions.
2. Example- combustion of magnesium in air, where magnesium combines with oxygen to form magnesium oxide.
$2 Mg(s) + O_{2} (g) \to 2 MgO(s) + Heat$

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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)

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