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(C) According to Fajan's rule,covalent character increases with the polarising power of the cation.Polarising power is directly proportional to the ch

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$HgCl_2$

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(C) According to Fajan's rule,covalent character increases with the polarising power of the cation.Polarising power is directly proportional to the charge density of the cation.For the given compounds,we compare the cations: $Zn^{2+}$,$Cd^{2+}$,$Hg^{2+}$,and $Cu^+$.$Hg^{2+}$ has a pseudo-noble gas configuration $(n-1)d^{10}$ and a high effective nuclear charge,which makes it highly polarising.Among the given options,$HgCl_2$ exhibits the highest covalent character due to the high polarising power of the $Hg^{2+}$ ion.

Out of the following,which one has the highest value of covalent character?

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