The correct set from the following in which both

Question:

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

  1. $\mathrm{LiF}>\mathrm{LiCl} ; \mathrm{MgO}>\mathrm{NaCl}$

  2. $\mathrm{LiCl}>\mathrm{LiF} ; \mathrm{NaCl}>\mathrm{MgO}$

  3. $\mathrm{LiF}>\mathrm{LiCl} ; \mathrm{NaCl}>\mathrm{MgO}$

  4. $\mathrm{LiCl}>\mathrm{LiF} ; \mathrm{MgO}>\mathrm{NaCl}$

Correct Option: 1,

Solution:

L.E. $\propto$ M.P.

L.E. : LiF > LiCl, $\mathrm{MgO}>\mathrm{NaCl}$

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