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(D) $1$. Covalent character: According to Fajan's rule,as the charge on the cation increases $(Na^+ < Mg^{2+} < Al^{3+})$,the polarizing power increas

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All of above are correct

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(D) $1$. Covalent character: According to Fajan's rule,as the charge on the cation increases $(Na^+ $2$. Lattice energy: $L.E. \propto \frac{Q_1 	imes Q_2}{r_+ + r_-}$. As the charge on the cation increases,the lattice energy increases. So,$NaF $3$. Melting point: Generally,melting point increases with lattice energy for ionic compounds. Thus,$NaF Therefore,all the given orders are correct.

Choose the correct order for the given properties.

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