JEE Main · 2006 · 30 Apr 2006 · Offline · Coordination Compounds

How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a

Ca^{2 +}

ion?

(A)Six
(B)Three
(C)One✓ Correct
(D)Two

Answer: (C)

Solution

EDTA is a hexadentate ligand: through its two nitrogen atoms and four carboxylate oxygens it offers six donor sites. An octahedral complex needs exactly six coordinate bonds, and a single EDTA molecule supplies all six as it wraps around the metal. Only one EDTA molecule is therefore required to make an octahedral complex with

C a^{2 +}

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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