First slide

IUPAC Nomenclature

Question

The correct structural formula of potassium tri oxalato aluminate (III) is

Moderate

A

$K_{3} [Al {(C_{2} O_{4})}_{3}]$
B

$K_{3} [Al {(C_{2} O_{4})}_{2}]$
C

$K_{2} [Al {(C_{2} O_{4})}_{2}]$
D

$K_{2} [Al {(C_{2} O_{4})}_{3}]$

Solution

Oxalato is $C_{2} O_{4}^{- 2}$ ;
oxidation state of ‘Al’ is “+3”
$∴$ the formula of the anionic complex is ${[Al {(C_{2} O_{4})}_{3}]}^{- 3}$
To compensate the negative charge, 3K⁺ ion are required.
$∴$ the formula of te complex is $K_{3} [Al {(C_{2} O_{4})}_{3}]$ .

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