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Question

The charge on the central metal ion in the complex [Ni(CO)4] is 
  1. 2
  2. 4
  3. 0
  4. 3


Solution

The correct option is C 0
This is a neutral complex, so the charge on the metal + that on the ligands would be = 0.
We also know that CO is a neutral ligand having a charge of 0.
If x is the oxidation number of Ni then:
x+4(0)=0
x = 0

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