The correct set from the following in which b | vedclass

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(A) The melting point $(M.P.)$ of ionic compounds is directly proportional to their lattice energy $(L.E.)$.Lattice energy depends on the charge of th

Vedclass · Accepted Answer

$LiF > LiCl ; MgO > NaCl$

Vedclass · Answer

(A) The melting point $(M.P.)$ of ionic compounds is directly proportional to their lattice energy $(L.E.)$.Lattice energy depends on the charge of the ions and the distance between them $(L.E. \propto \frac{q_1 q_2}{r_+ + r_-})$.For the pair $LiF$ and $LiCl$,$LiF$ has a smaller anion $(F^-)$ compared to $Cl^-$,resulting in a shorter interionic distance and higher lattice energy,so $LiF > LiCl$.For the pair $MgO$ and $NaCl$,$MgO$ consists of $Mg^{2+}$ and $O^{2-}$ ions (charges $\pm 2$),while $NaCl$ consists of $Na^+$ and $Cl^-$ ions (charges $\pm 1$). Higher charges in $MgO$ lead to significantly higher lattice energy,so $MgO > NaCl$.Therefore,the correct order is $LiF > LiCl$ and $MgO > NaCl$.

The correct set from the following in which both pairs are in correct order of melting point is :-

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