Combination reaction

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A Combination Reaction or a Synthesis Reaction is a general category of a chemical reaction (the term usually refers to an inorganic chemical reaction), in which two or more reagents are chemically bonded together to produce a single product.

For example, the addition of sulphur and iron to form iron sulphide is a combination reaction.

A combination reaction can be of three types:
a) Between 2 elements
b) Between 2 compounds
c) Between an element and a compound

Examples:
a) 2Mg+O2 → 2Mg0
b) CaO+H2O → Ca(OH)2
c) 2CO+O2 → 2CO2

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