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JEE Main202124 Feb 2021Evening ShiftChemistryChemical Bonding and Molecular StructureActual

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

Options

  1. ALiF > LiCl ; NaCl > MgO
  2. BLiCl > LiF ; MgO > NaCl
  3. CLiCl > LiF ; NaCl > MgO
  4. DLiF > LiCl ; MgO > NaCl

Correct answer

D. LiF > LiCl ; MgO > NaCl

Step-by-step solution

Lattice energy is defined as the amount of energy required to separate one mole of solid ionic compound into its gaseous ions. Evidently greater the lattice energy, higher is the melting point of the alkali metals halide and lower is its solubility in water. L . E . ∝ M . P . L . E .   :   LiF > LiCl ,   MgO > NaCl

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