Which compound has the highest melting point?

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KCI

MgO

CaO

NaCI

answer is A.

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Detailed Solution

Among the following, MgO has the greatest melting point. Because ${Na}_{2} OMgO,$ and ${Al}_{2} O_{3}$ comparison Ionic compounds have greater melting points than covalent compounds, which is why MgO has a higher melting point. Magnesium has a 2+ charge, while the oxide ion has a 2- charge.

MgO

Hence, the correct option is A

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