Question

How many EDTA (ethylenediaminetetra acetic acid) molecules are required to make an octahedral complex with a $C{a}^{2+}$ ion ?

• A. six
• B. three
• C. one
• D. two

Answer 1

Answer: (C)

EDTA (Ethylenediaminetetra acetic acid)
It is hexadentate (6 electron pairs) that's why for octahedral complex only one EDTA is required.