ANSWER
[tex]\text{ N}_{2(g)}\text{ + O}_{2(g)}\text{ }\rightarrow\text{ 2NO}_{(g)}[/tex]
EXPLANATION
A combination reaction is defined as the type of reaction where two or more elements or compounds are combined together to form a single product.
[tex]\text{ A + B }\rightarrow\text{ AB}[/tex]
The above chemical reaction equation is an example of a combined reaction
Looking at the options, you will see that the chemical equation in option A shows a combined reaction
Hence, option A is correct
