JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Coordination Compounds

EDTA

^{4 -}

is ethylenediaminetetraacetate ion. The total number of

N - C o - O

bond angles in

[C o (E D T A)]^{1 -}

complex ion is

Answer: 8

Solution

EDTA is a hexadentate ligand that coordinates to Co through 2 nitrogen atoms and 4 oxygen atoms (from the four carboxylate groups), forming an octahedral complex.

In the octahedral

[C o (E D T A)]^{-}

complex:

Each N atom is bonded to Co
Each of the 4 O atoms is bonded to Co

The N-Co-O bond angles are those between a nitrogen donor atom and an oxygen donor atom with Co at the vertex.

Each N can form angles with 4 O atoms: 2 N × 4 O = 8 N-Co-O bond angles.

JEE Advanced · 2013 · 02 Jun 2013 · Paper 1 · Integer answer

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