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Q.

Which compound has the highest melting point?

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a

KCI

b

MgO

c

CaO

d

NaCI

answer is A.

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Detailed Solution

Among the following, MgO has the greatest melting point. Because Na2OMgO, and Al2O3 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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