Question

What iscombined reaction give an example of combination eeaction which is also ethermic?

Answer 1

Combination reactions are always exothermic. For example barium metal and fluorine gas will combine in a highly exothermic reaction to form the salt barium fluoride: Another example is given by magnesium oxide combining with carbon dioxide: Often, reaction can fall into more than one category.

Answer 2

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When two (or) More than two elements combine to form a one (or) more than one new compound is known as combination reaction. Combination reactions are usually exothermic .

Examples of combination reaction :-

(1) C₆H₁₂O₆ +6O₂ $\longrightarrow$ 6CO₂ + 6H₂O

(2) 4Fe + 3O₂ $\longrightarrow$ 2Fe₂O₃

(3) C + O₂ $\longrightarrow$ CO₂

(4) CaO + H₂O $\longrightarrow$ Ca(OH)₂

(5) MgO + CO₂ $\longrightarrow$ MgCO₃