Question

Statement 1: Charge on the complex of ferric ion with EDTA is minus one.
Statement 2:EDTA is a hexadentate ligand.

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation o f the statement 1.
• B. Ifboth Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true.

Answer 1

Answer: (B)

Statement-1: EDT A has $-4$ charge and iron has $+3$.
So net charge on complex is $-1$
Statement-2: Two nitrogen and four oxygen atoms act as donor atoms so hexadentate. $EDT{A}^{4-}$ forms very stable complexes with most of the transition metals. This hexadentate ligand forms very stable complexes (usually octahedral structures) with most of the transition metals.
The donor atoms in $EDT{A}^{4-}$ are the two $N$ atoms, and the four negatively charged $O$ atoms.
Both are true but the reason is not the correct explanation for the assertion.