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The formula for sodium trioxalatoaluminate (III) is

ChemistryCoordination CompoundsCOMEDKCOMEDK 2015

Options:

A $\mathrm{Na}_{4}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
B $\mathrm{Na}_{3}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)\right]_{3}$
C $\mathrm{Na}_{3}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
D $\mathrm{Na}_{2}\left[\mathrm{Al}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$