A) \[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{3}}\]
B) \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
C) \[{{K}_{2}}[ZnC{{l}_{4}}]\]
D) \[{{K}_{2}}[Hg{{I}_{4}}]\]
Correct Answer: D
Solution :
The total number of electrons on the central atom, including those gained from ligands in the bonding is called the effective atomic number of the central metal ion. (a)\[[Co(N{{H}_{3}})]C{{l}_{3}}\] Electrons in \[C{{o}^{3+}}\]ion\[=27-3=24\] electrons Electrons donated by\[(6\mathbf{:}N{{H}_{3}})=2\times 6=12\]electrons EAN of \[Co(III)\]is\[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{3}}=36\]electrons. (b)\[{{K}_{4}}[Fe{{(CN)}_{6}}]\] Electrons in \[F{{e}^{2+}}\] ion\[=26-2=24\] electrons Electrons donated by\[6(\mathbf{:}\bar{C}N)=2\times 6=12\] electrons EAN of \[Fe(II)\] in\[{{K}_{4}}[Fe{{(CN)}_{6}}]=36\]electrons (c)\[{{K}_{2}}[ZnC{{l}_{4}}]\] Electrons in \[Z{{n}^{2+}}\] ion \[=30-2=28\] electrons Electrons donated by\[4[\mathbf{:}\underset{\centerdot \,\,\,\centerdot }{\mathop{Cl}}\,\mathbf{:}]=2\times 4=8\]electrons EAN of \[Zn(II)\] in \[={{K}_{2}}[ZnC{{l}_{4}}]=36\]electrons (d)\[{{K}_{2}}[Hg{{I}_{4}}]\] Electrons in \[H{{g}^{2+}}\] ion\[=80-2=78\] electrons Electrons donated by\[4[\mathbf{:}\underset{\centerdot \,\,\,\centerdot }{\mathop{{\bar{I}}}}\,\mathbf{:}]\xrightarrow{{}}4\times 2=8\]electrons EAN of \[Hg(II)\] in\[{{K}_{2}}[Hg{{I}_{4}}]=86\]electrons
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