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

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

  1. A

    LiF>LiCl;   MgO>NaCl

  2. B

    LiCl>LiF;  NaCl>MgO

  3. C

    LiF>LiCl;  NaCl>MgO

  4. D

    LiCl>LiF;  MgO>NaCl

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    Solution:

    Lattice energy          α           Melting point 
          ( L.E.)                                    ( M.P.) 
    L.E.:LiF>LiCl

    L.E.:MgO>NaCl

    Lattice energy depends on the size of the ion. Smaller the size of anion or cation, higher the value of L.E.  LE  α  z+zd

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