The oxidation number of Co in \( \left[\mathrm{Co}\left(\mathrm{NH}...

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The oxidation number of Co in \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right] \) is :
(WB JEE 2013)
(a) \( +3 \)
(b) 0
(c) \( -3 \)
(d) \( +6 \)
\( \mathrm{P} \)
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