Of the options below, which is generally associated with the lowest boiling temperatures when it is the only type of bond present in a material? a. metallic b. covalent c. London dispersion forces d. ionic

Explanation:

Of all the given forces , london dispersion force is the weakest inter-molecular force which is temporary in nature . This force results due to two adjecent atoms  or molecules becoming dipoles temporarily. This force exists among the atoms of inert gases.

Atoms having this force have lowest boiling point.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.