Among ${MgCl}_{2}, RbCl, {BeCl}_{2}$ and $LiCl$ the compounds with the highest and the lowest % of ionic characters are :

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${MgCl}_{2}$ and ${BeCl}_{2}$

$RbCl$ and $LiCl$

${BeCl}_{2}$ and ${MgCl}_{2}$

$RbCl$ and ${BeCl}_{2}$

answer is B.

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Detailed Solution

The size of the cation grows with its ionic character, hence among the listed chlorides, Rb has a greater sine, and Be has the smallest size. $RbCl$ is the compound that has the most ionic property.
${BeCl}_{2}$ is the compound with the most ionic characteristics.

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