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Question

Which of the following is the correct order of melting point?
  1. LiCl<NaCl
  2. NaCl<KCl
  3. KCl<RbCl
  4. All of the above


Solution

The correct option is A LiCl<NaCl
As we move down the group, lattice energy decreases. Hence, the melting point decreases.
However, due to polarisation of Cl ion by Li+, LiCl is highly covalent and hence it has a lower melting point than NaCl.

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