A) \[NaCl\]
B) \[KCl\]
C) \[MgO\]
D) \[BaO\]
Correct Answer: C
Solution :
Melting points, among other things, depend upon lattice energy. Now\[NaCl\]and\[KCl\]have unit charge on their ions while\[MgO\]and\[BaO\] have two units of charge, therefore, lattice energies of\[MgO\]and\[BaO\]are expected to be larger than those of\[NaCl\]and\[KCl\]. Further since\[M{{g}^{2+}}\]is smaller than\[B{{a}^{2+}},\]therefore, \[MgO\]has the highest lattice energy and hence has the highest melting point.
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