Which of the following diagrams shows the cor | vedclass

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(A) According to Fajans' rule,the covalent character increases with the polarising power of the cation. Polarising power $\propto 	ext{charge density

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(A) According to Fajans' rule,the covalent character increases with the polarising power of the cation. Polarising power $\propto 	ext{charge density} \propto \frac{	ext{charge}}{	ext{size}}$. Ionic character is inversely proportional to covalent character. Therefore,ionic character $\propto \frac{1}{	ext{polarising power}}$. Comparing the cations: $Rb^+$ (charge $+1$,large size) has the lowest polarising power,so $RbCl$ is the most ionic. $Ca^{2+}$ (charge $+2$,smaller size) has higher polarising power than $Rb^+$. $Zn^{2+}$ (charge $+2$,pseudo-noble gas configuration,small size) has the highest polarising power among these,so $ZnCl_2$ is the most covalent (least ionic). $Ba^{2+}$ (charge $+2$,large size) has lower polarising power than $Ca^{2+}$. Order of ionic character: $RbCl > BaCl_2 > CaCl_2 > ZnCl_2$. Looking at the cycle: $RbCl ightarrow CaCl_2$ (Decrease) $CaCl_2 ightarrow ZnCl_2$ (Decrease) $ZnCl_2 ightarrow BaCl_2$ (Increase) $BaCl_2 ightarrow RbCl$ (Increase) This matches diagram $A$.

Which of the following diagrams shows the correct change in the ionic character of the given compounds according to Fajans' rule?

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