Question

Amongst $LiCl,RbCl,Be{Cl}_2$ and $Mg{Cl}_2$ the compounds with greatest and least ionic character respectively are:

• A. $LiCl$ and $RbCl$
• B. $RbCl$ and $Be{Cl}_2$
• C. $RbCl$ and $Mg{Cl}_2$
• D. $Mg{Cl}_2$ and $Be{Cl}_2$

Answer 1

The correct option is B $RbCl$ and $Be{Cl}_2$

According to Fajan's rule, for a greater covalent

characters the cation should be of smaller size and

anion should be of large size

Also compound with high covalent characteristic

have low ionic characters

$B{e}^{2+}$ has small size as com pared to $L{i}^{+},R{b}^{+},m_g^{2+}$

$\therefore BeC{l}_2$ has loast ionic characters

& RbCl has maximum ionic character.