Which from following formulae is of trioxalatocobaltate(III) ion?

Which from following formulae is of trioxalatocobaltate(III) ion?
  1. $\left[\mathrm{Co}_3\left(\mathrm{C}_2 \mathrm{O}_4\right)\right]^{3-}$
  2. $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3+}$
  3. $\left[\mathrm{Co}_3\left(\mathrm{C}_2 \mathrm{O}_4\right)\right]^{3+}$
  4. $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$

Solution

Trioxalatocobaltate(III) ion : $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$

Asked in: MHT CET 2023 (13 May Shift 1)

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