11th Class Chemistry Alkali Metals Question Bank Alkali Metals

  • question_answer mongst \[LiCl,\ RbCl,\ BeC{{l}_{2}}\] and \[MgC{{l}_{2}}\]the compounds with the greatest and least ionic character respectively are [Pb. CET 2004]

    A) \[LiCl\] and \[RbCl\]

    B) \[MgC{{l}_{2}}\]and \[BeC{{l}_{2}}\]

    C) \[RbCl\] and \[BeC{{l}_{2}}\]

    D) \[RbCl\] and \[MgC{{l}_{2}}\]

    Correct Answer: C

    Solution :

    According to Fajan's rule RbCl has greatest ionic character due to large ionic size of \[R{{b}^{+}}\] ion. \[BeC{{l}_{2}}\] has least ionic (Maximum covalent) due to small size of \[B{{e}^{+2}}\] ion which has highly polarising.

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