Which of the following cannot be a ligand?(a) Ni^2+(b) Cl^–(c) H2O(d) NH3I got this question in a national level competition.My doubt stems from Definitions in section Coordination Compounds of Chemistry – Class 12

Which of the following cannot be a ligand?(a) Ni^2+(b) Cl^–(c) H2O(d

1.	Which of the following cannot be a ligand?(a) Ni^2+(b) Cl^–(c) H2O(d) NH3I got this question in a national level competition.My doubt stems from Definitions in section Coordination Compounds of Chemistry – Class 12
Answer» The correct choice is (a) Ni^2+ The explanation is: The ions/molecules BOUND to the central atom/ion is called a ligand. Ni^2+ is a metal ion, and according to WERNER the secondary valences can be satisfied only by NEUTRAL molecules or negative ions. Cl^–, H2O and NH3 are all possible ligands.

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