Q32 · CSIR NET Chemistry, December 2018
Paper: CSIR NET December 2018 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Medium
For magnesium complex of $\mathrm{EDTA}^{2-}$, the number of N -donor and O -donor centers, are respectively.
(a)two and four
(b)two and two
(c)two and six
(d)two and eight
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed B; on checking, A is correct — see the explanation.
Printed B; EDTA has four carboxylate O donors, not two.
Explanation
EDTA⁴⁻ is hexadentate: two amine N donors and four carboxylate O donors. In [Mg(EDTA)]²⁻ it binds through all six.
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