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

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(B) According to Fajan's rule,the covalent character increases as the size of the cation decreases and its charge density increases. Conversely,the io

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$RbCl$ and $BeCl_2$

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(B) According to Fajan's rule,the covalent character increases as the size of the cation decreases and its charge density increases. Conversely,the ionic character increases as the size of the cation increases. Comparing the cations $Rb^+$,$Mg^{2+}$,$Li^+$,and $Be^{2+}$: $1$. The size order is $Rb^+ > Mg^{2+} > Li^+ > Be^{2+}$. $2$. Since $Rb^+$ has the largest size,$RbCl$ has the highest ionic character. $3$. Since $Be^{2+}$ has the smallest size and highest charge density,$BeCl_2$ has the lowest ionic character (highest covalent character). Therefore,the compounds with the highest and lowest ionic characters are $RbCl$ and $BeCl_2$ respectively.

Among $MgCl_2, RbCl, BeCl_2$ and $LiCl$,the compounds with the highest and the lowest $\%$ of ionic characters are

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