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Q.
Which of the following substances has least ionic character?
The d-and f-Block Elements
Solution:
More the polarising power of cation, more will be the covalent character or less ionic character. $Zn ^{2+}$ and $Hg ^{2+}$ have pseudo noble gas configuration $(n-1) d^{10}$, thus they have stronger polarising power than $Fe ^{2+}$. However, $Zn ^{2+}$ is more polarising because of smaller size as compared to $Hg ^{2+}$. Hence, $ZnCl _{2}$ is most covalent or least ionic compound among the given compounds.