The oxidation number of the central metal in a coordination entity is always a positive quantity.(a) True(b) FalseThis question was addressed to me in a job interview.My doubt stems from Definitions topic in section Coordination Compounds of Chemistry – Class 12

The oxidation number of the central metal in a coordination entity is

1.	The oxidation number of the central metal in a coordination entity is always a positive quantity.(a) True(b) FalseThis question was addressed to me in a job interview.My doubt stems from Definitions topic in section Coordination Compounds of Chemistry – Class 12
Answer» RIGHT choice is (b) False The best I can explain: The oxidation number might not ALWAYS be positive. It can also be 0 or a negative value. For example, the oxidation number of COBALT in K[Co(CO)4] is -1.

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