11th Class Chemistry Alkali Metals Question Bank Alkali Metals

  • question_answer Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point [AIEEE 2005]

    A) LiCl

    B) NaCl

    C) KCl

    D) RbCl

    Correct Answer: B

    Solution :

    Although lattice energy of \[LiCl\] higher than \[NaCl\] but \[LiCl\] is covalent in nature and \[NaCl\] ionic there after, the melting point decreases as we move \[NaCl\] because the lattice energy decreases as a size of alkali metal atom increases (lattice energy \[\propto \] melting point of alkali metal halide)

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