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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 30 of 43
Marks: +1, -0
The oxidation number of cobalt in K[Co(CO)4]\mathrm{K}[\mathrm{Co}(\mathrm{CO})_4] is
(a) + 1
(b) +3
(c) – 1
(d) –3
Solution:  
(c) : +1+x+4(0)=0+1 + x + 4(0) = 0
∴  x=−1.\therefore\; x = -1.
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