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Question

Amongst LiCl, RbCl, BeCl2 and MgCl2, maximum and minimum ionic character will be shown by the compounds:

A
LiCl, MgCl2
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B
RbCl, BeCl2
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C
RbCl, MgCl2
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D
MgCl2, BeCl2
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Solution

The correct option is B RbCl, BeCl2
According to Fajans' rule, smaller the size of the cation and larger the size of the anion, greater is the covalent character. Here, the largest cation is Rb+ and the smallest cation is Be2+.
RbCl is the most ionic BeCl2 is the least ionic.

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