Draw a graph showing variation of potential energy of a pair of nucleons as a function of their separation. Indicate the region in which nuclear force is (i) attractive (or) repulsive.

c. electrical charges of ionic bonds.

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Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.