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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.when two or more substances combine to form a single product, it is known as a combination reaction. This reaction is usually exothermic because when the bond forms between the elements, heat is released.

A combination reaction can be of three types:
a) Between 2 elements
b) Between 2 compounds
c) Between an element and a compound
IT can also be divided into sub types of omkar kulkarni Examples:
a) 2Ag+O₂ → 2AgO
b) O+H₂O → H₂O₂
c) 2C(s) +2O₂(g) → 2CO₂ (g)
d) CaO+H₂O → Ca(OH)₂

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