In aqueous solution, the coordination number of Al in aluminates is

Solution:

Aluminate ion is ${AlO}_{2}^{-}$ but when in aqueous solution, it is surrounded by four water molecules out of which two water molecules react with oxygen atoms to give four hydroxide ion. Therefore, in aqueous solution, the probable aluminate species has the formula, $[Al {(H_{2} O)}_{2} (OH)_{4}]$ .

Coordination number is the number of ligands attached to the central metal. The coordination number of Al in $[Al {(H_{2} O)}_{2} {(OH)}_{4}]$ is 6.

Solution:

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