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  4. The oxidation number of cobalt in K[Co(CN)4] is

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Q. The oxidation number of cobalt in $K[Co(CN)_4]$ is

MP PMTMP PMT 2001Coordination Compounds

Solution:

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