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Answer: (a) [Co(NO2)3(NH3)3]

Charge on the coordination sphere = +3 (Co3+) + 3(−1) (three NO2−) + 3(0) (three NH3) = 0, so it is a neutral complex with no counter ion. In (b) the complex ion is a cation [Co(NH3)5CO3]+, while (c) and (d) contain the anionic complexes [Co(NO2)6]3− and [Co(C2O4)3]3−.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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