Of the reactions below, which one is not a combination reaction? A) 2CH₄+ 4O₂-2CO₂+ 4H₂O B) CaO + H₂O - Ca(OH)₂ C) 2Mg + O₂- 2MgO D) C + O₂- CO₂ E) 2N₂+ 3H₂- 2NH₃

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Combination reactions involve the combination of two or more substances to form a single product. In choice A, two molecules of methane (CH4) combine with four molecules of oxygen (O2) to form two molecules of carbon dioxide (CO2) and four molecules of water (H2O). This is a combustion reaction, not a combination reaction.

Of the Reactions Below, Which One Is Not a Combination