Identify the formula of potassium trioxalato aluminate (III)

Identify the formula of potassium trioxalato aluminate (III)
  1. $\mathrm{K}_{4}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
  2. $\left[\mathrm{K}_{3} \mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
  3. $\mathrm{Al}_{3}\left[\mathrm{~K}_{3}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
  4. $\mathrm{K}_{3}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$

Solution

$\mathrm{C}_{2} \mathrm{O}_{4}^{2-} \rightarrow$ Bidentate ligand, Oxidation state of $\mathrm{Al}=+3$ $\therefore$ Formula is $\mathrm{K}_{3}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$.

Asked in: MHT CET 2020 (13 Oct Shift 2)

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