Question: The correct set from the following in which both pairs are in correct order of melting point is :-
$\mathrm{LiF}>\mathrm{LiCl} ; \mathrm{MgO}>\mathrm{NaCl}$
$\mathrm{LiCl}>\mathrm{LiF} ; \mathrm{NaCl}>\mathrm{MgO}$
$\mathrm{LiF}>\mathrm{LiCl} ; \mathrm{NaCl}>\mathrm{MgO}$
$\mathrm{LiCl}>\mathrm{LiF} ; \mathrm{MgO}>\mathrm{NaCl}$
Correct Option: 1,
Solution:
L.E. $\propto$ M.P.
L.E. : LiF > LiCl, $\mathrm{MgO}>\mathrm{NaCl}$
