1.

Which of the following substances has the highest melting point?A)NaClB)KClC)MgOD)BaO

Answer» MgO has a high melting point because of the difference in lattice energy.They all have the same FCC lattice structure, but the lattice energy of MgO is roughly 4 times that NaCl and KCl because it is proportional to Z+.Z- Since lattice energy is disproportional to this distance, that could be why the lattice energy of MgO is larger than that of BaO.


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