In Ni(CO)4 what is the oxidation number of Ni?

Let x be the oxidation number of Ni in Ni(CO)4 .

Since the overall charge on the complex is 0,

The sum of oxidation states of all elements in it should be equal to 0.

Therefore, x + 4 ( 0 ) = 0

Hence, x = 0.

Thus, the oxidation number of Ni in Ni(CO) 4 is 0.

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