Choose the best answer to the following.
Which would you expect to have a higher melting point: sodium chloride, NaCl, or aluminum oxide, Al2O3?
(a) The aluminum oxide has a higher melting point because it is a larger molecule and has a greater number of molecular interactions.
(b) NaCl has a higher melting point because it is a solid at room temperature.
(c) The aluminum oxide has a higher melting point because of the greater charges of the ions, and hence the greater force of attractions between them.
(d) The aluminum oxide has a higher melting point because of the covalent bonds within the molecule.
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