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Answer :

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Combination Reaction -

  • A chemical reaction in which two or more substances ( elements or compounds ) combine to form a single substance is called a combination reaction. The Combination reactions are of three types:

1. Combination between two elements :

2H2(g) + O2(g)⸻➤2H2O(l)

N2(g) + 3H2⸻➤2NH3(g)

C(s) + O2(g) ⸻➤CO2(g)

The combination reactions as shown in which a new compound is formed from its constituent elements are also called synthesis reactions.

2. Combination between two compounds-

CaO(s)+ H2O(l)⸻➤Ca(OH)2(aq)+ heat

quicklime⠀⠀⠀⠀⠀slakedlime

3. Combination between an element and a compound :

2CO(g)+O2(g) ⸻➤2CO2(g)

2NO(g) + O2(g) ⸻➤2NO2(g)

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