The oxidation number of \( \mathrm{Cr} \) in \( \mathrm{Cr}(\mathrm{CO})_{6} \) is : (A) 0 (B) \...

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The oxidation number of \( \mathrm{Cr} \) in \( \mathrm{Cr}(\mathrm{CO})_{6} \) is :
(A) 0
(B) \( +2 \)
(C) \( -2 \)
(D) \( +6 \)
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