Question

Give one example of a combination reaction exothermic

Answer 1

barium metal and fluorine gas will combine in a highly exothermic reaction to form the salt barium fluoride.

Answer 2

When two or more elements combine to form a single element, then this type of reaction is known as Combination Reaction.

OR

When A and B reactants combine then they form a single product AB, then this type of reaction is known as Combination Reaction.

i.e.

A + B ----› AB
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$\textbf{Example}$  

1) CaO + H2O ------› Ca(OH)2 (exothermic reaction)

2) 2H2 + O2 -------› 2H2O

3) C + O2 -------› CO2
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NOTE :-

* Combination Reactions are exothermic. As heat is produced during their bond formation in reactants. 
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