Choose the pair of substances that are most likely to form a homogeneous solution. a. c6h14 and c10h20 b. libr and c5h12 c. n2o4 and nh4cl d. c6h14 and h2o e. none of these pairs will form a homogeneous solution.

Answer is: a. c6h14 and c10h20.
This pair will most likely form a homogeneous solution because they are both nonpolar substances and "like dissolves like".
Other pairs will not form homogeneous solution because nonpolar substances have low solubility in polar or ionic substances (for example LiBr is ionic and C₅H₁₂ is nonpolar).

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.