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How many EDTA (ethylenediaminetetraacetic acid) molecules are needed to form an octahedral complex with one Ca2+ ion?

1. One
2. Two
3. Six
4. Three

Correct answer: One

Solution

An octahedral complex with a Ca2+ ion can be formed by a single EDTA molecule, as EDTA acts as a hexadentate ligand, coordinating through its six donor atoms to the metal ion.

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