Amongst LiCl,RbCl,BeCl_2,and MgCl_2,the compo | vedclass

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(B) According to Fajan's rules,the ionic character of a compound depends on the polarizing power of the cation.Smaller and highly charged cations have

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$RbCl$ and $BeCl_2$

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(B) According to Fajan's rules,the ionic character of a compound depends on the polarizing power of the cation.Smaller and highly charged cations have greater polarizing power,leading to higher covalent character and lower ionic character.Larger and less charged cations have lower polarizing power,leading to higher ionic character.Comparing the cations: $Rb^+$ (largest size,$+1$ charge),$Li^+$ ($+1$ charge),$Mg^{2+}$ ($+2$ charge),and $Be^{2+}$ (smallest size,$+2$ charge).$RbCl$ has the largest cation with the lowest charge,making it the most ionic.$BeCl_2$ has the smallest cation with a high charge,making it the most covalent (least ionic).Therefore,the compound with the greatest ionic character is $RbCl$ and the one with the least ionic character is $BeCl_2$.

Amongst $LiCl$,$RbCl$,$BeCl_2$,and $MgCl_2$,the compounds with the greatest and the least ionic character,respectively,are:

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