(A) $EDTA^{4-}$ is a hexadentate ligand,meaning it occupies $6$ coordination sites around a central metal ion. Since $Ca^{2+}$ forms an octahedral com

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(A) $EDTA^{4-}$ is a hexadentate ligand,meaning it occupies $6$ coordination sites around a central metal ion. Since $Ca^{2+}$ forms an octahedral complex with a coordination number of $6$,a single $EDTA^{4-}$ molecule is sufficient to satisfy all $6$ coordination sites. Therefore,$1$ molecule of $EDTA$ is required.