The correct order of melting points of the fo | vedclass

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Question

(A) The melting point of ionic compounds depends on the lattice energy of the crystal lattice.Lattice energy is inversely proportional to the interion

Vedclass · Accepted Answer

$I > II > III$

Vedclass · Answer

(A) The melting point of ionic compounds depends on the lattice energy of the crystal lattice.Lattice energy is inversely proportional to the interionic distance.As the size of the anion increases from $F^{-}$ to $Cl^{-}$ to $I^{-}$, the interionic distance increases, leading to a decrease in lattice energy.Therefore, the melting point decreases in the order $LiF > LiCl > LiI$.This corresponds to the order $I > II > III$.

The correct order of melting points of the following salts is $LiF$ $(I)$, $LiCl$ $(II)$, $LiI$ $(III)$.

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