The reversible reaction, 2NO{g) ⇌ N2 (g) + O2 (g), would be classified as a reaction. homogeneous
heterogeneous
endothermic

The answer is c fish

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).