The correct order of polarising power is:

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(A) According to Fajan's rule,the polarising power of a cation depends on its charge density.$1$. Higher the charge on the cation,the greater is its p

Vedclass · Accepted Answer

$Cs^{+} < K^{+} < Mg^{2+} < Al^{3+}$

Vedclass · Answer

(A) According to Fajan's rule,the polarising power of a cation depends on its charge density.$1$. Higher the charge on the cation,the greater is its polarising power.$2$. Smaller the size of the cation,the greater is its polarising power.Comparing the given ions: $Cs^{+}$ ($1+$ charge,large size),$K^{+}$ ($1+$ charge,smaller than $Cs^{+}$),$Mg^{2+}$ ($2+$ charge,smaller than $K^{+}$),and $Al^{3+}$ ($3+$ charge,smallest size).Therefore,the correct order of polarising power is $Cs^{+} < K^{+} < Mg^{2+} < Al^{3+}$.

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