Which has the greater melting point, $N a C l$ or $A l {C l}_{3}$ ?

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Solution

We know that ionic compounds have more melting and boiling points than covalent compounds

Comparing NaCl and $A l C l_{3}$ . NaCl is more ionic than $A l C l_{3}$ because ionic character depends on the size of cations. As here anions are same, more the size of cation, more the ionic character. $N a^{+}$ has more size than $A l^{3 +}$ . So the melting point of NaCl is much higher than that of $A l C l_{3}$

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