Home Courses Contact About

1. ⇒ (MHT CET 2023 11th May Evening Shift )

Identify the formula of potassium trioxalatoaluminate(III).

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

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

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

D. $K_{4} {[{Al}_{3} {(C_{2} O_{4})}_{3}]}^{2 +}$

Correct Option is (A)

The formula for potassium trioxalatoaluminate(III) is correctly represented by Option A :

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

This formula indicates that the compound is composed of a complex ion of aluminum trioxalato (with aluminum in a +3 oxidation state, as indicated by the "(III)" in the name) and three potassium ions (K⁺) to balance the charge of the complex ion. The oxalate ion $C_{2} O_{4}^{2 -}$ is a bidentate ligand, meaning it forms two bonds with the central aluminum ion. Since there are three oxalate ions, each carrying a -2 charge, the total charge of the complex ion is -6, which is balanced by three K⁺ ions, each carrying a +1 charge, resulting in a neutral overall compound.

⇒Coordination_compound