A) In \[{{K}_{3}}[Fe{{(CN)}_{6}}],\], the ligand has satisfied only the secondary valency of ferric ion
B) In \[{{K}_{3}}[Fe{{(CN)}_{6}}],\]the ligand has satisfied both primary and secondary; valancies of ferric ion
C) In \[{{K}_{4}}[Fe{{(CN)}_{6}}],\] the ligand has satisfied both primary and secondary valancies of ferrous ion
D) In \[[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}\]the ligand has satisfied only the secondary valency of copper
Correct Answer: A
Solution :
Primary valency of metal is satisfied only by the anion. It is simply ionic valency. While secondary valency is satisfied by ligands (which can give a lone-pair of \[{{e}^{-}}\]). The ligands satisfying secondary valency, are always written in co-ordination sphere. This concept was given by Wemer. In \[{{K}_{3}}[Fe{{(CN)}_{6}}],\], the \[C{{N}^{-}}\]ions satisfy both the primary as well as secondary valency of \[F{{e}^{3+}}\]ion.
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