Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?

  • Option 1)

    LiCl

  • Option 2)

    NaCl

  • Option 3)

    KCl

  • Option 4)

    RbCl

 

Answers (1)

As we learnt in

Alkali Metal -

Each period starts with an alkali metal whose outermost electronic configuration is ns1

-

 

 Despite the fact that LiCl has higher lattice energy than NaCl,  LiCl has lower melting point because of its covalent nature. Also, as we go down the group's lattice energy generally decreases as size of alkali metal atom increases.


Option 1)

LiCl

This option is incorrect.

Option 2)

NaCl

This option is correct.

Option 3)

KCl

This option is incorrect.

Option 4)

RbCl

This option is incorrect.

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