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