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Define combination reaction . Give o...

Define combination reaction . Give one example for an exothermic combination reaction .

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(i) A combination reaction is a reaction in which two or more reactants combine to form a compound .
(ii) It is Otherwise called synthesis reaction or composition reaction .
(iii ) eg. On burning magnesium in air , it combines with oxygen to form magnesium oxide .
`2Mg_((s)) +O_(2(g)) to 2MgO_((s))`
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