Question

Of the reactions below, which one is not a combination reaction?

A. 2 CH4 + 4 O2 --> 2 CO2 + 4 H20
B. 2 N2 + 3 H2 --> 2 NH3
C. CaO + H2O --> Ca(OH)2
D. C + O2 --> CO2
E. 2 Mg + O2 --> 2 Mgo

Answer 1

Option D. C + O2 --> CO2 is not a combination reaction.

Step-by-step explanation:

The reaction that is not a combination reaction from the given options is option D. C + O2 → CO2.

A combination reaction is a type of chemical reaction where two or more substances combine to form a single product. In option D, carbon (C) reacts with oxygen (O2) to form carbon dioxide (CO2), which is a combination reaction.

Option D is a combustion reaction where carbon reacts with oxygen to form carbon dioxide. Combustion reactions involve the reaction of a substance with oxygen to produce heat and light.