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 valencies of ferric ion.
C) In \[{{K}_{4}}[Fe{{(CN)}_{6}}],\] the ligand has satisfied both primary and secondary valencies 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 :
In \[{{K}_{3}}[Fe{{(CN)}_{6}}]\] the ligand are negative which is present in coordination spheres shows a dual behaviour. It may satisfied both primary & secondary valencies while neutral ligand satisfied only secondary valencies.
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