A) \[{{[Zn{{(CN)}_{4}}]}^{2-}}\]
B) \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
C) \[{{[Cu{{(CN)}_{4}}]}^{2-}}\]
D) \[{{[Ni{{(N{{H}_{3}})}_{4}}]}^{2+}}\]
Correct Answer: B
Solution :
Co-ordination number is equal to total number of ligands in a complex.
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