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# The polorising power of $Mg^{2+}$ is nearly same as that of

$\begin{array}{1 1}(a)\;Li^+&(b)\;Ba^{2+}\\(c)\;Al^{3+}&(d)\;All\end{array}$

$Li^{+}$,mg shows diagonal relationship with Al.
Hence (a) is the correct answer.