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

E

Explanation:

A combination reaction is one in which two elements or two compounds react to give a new single compound

Hence, what we are expecting on the reactant side is only a single product and not a mixture of products

For the first reaction, we had two elements giving a single product

For the second reaction, we had same

For the third, we had same

For the fourth, we had two compounds reacting to give a singe new product

While in the last, we had two different products which means it does not follow the definition of a combination reaction and that makes it our answer