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Question

The EAN of metal atoms in [Fe(CO)2(NO+)2] and Co2(CO)8 respectively are:
(correct answer +2, wrong answer -0.5)

A
34,35
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B
34,36
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C
36,36
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D
36,35
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Solution

The correct option is C 36,36
Oxidation state of Fe in [Fe(CO)2(NO+)2] is:
x+2(0)+2=0
x=2
so EAN =26+2+8=36

Oxidation state of Co in Co2(CO)8=2x+8(0)=0
x=0
(CO)4CoCo(CO)4

Each Co will get one electron by sharing between them.
Hence EAN for both Co=27+1+8=36

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