1.

The oxidation number of cobalt in `K [Co(CO)_(4)]` isA. `+1`B. `-1`C. `+3`D. `-3`

Answer» Correct Answer - C
Let O.S. of Co in the complex = x
O.S. of K = `+1, O.S. of CN = -1`
`1+x + 4(-1)` = 0
x = 3


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