CUET Preparation Today
Which of the following statements is not correct? |
In oxyhaemoglobin, \(Fe^{2+}\) is paramagnetic. During respiration, the size of \(Fe^{2+}\) increases when it changes from a diamagnetic to a paramagnetic state. Four heme groups are present in haemoglobin. Heme is the prosthetic group and it is a nonprotein part of haemoglobin. |
In oxyhaemoglobin, \(Fe^{2+}\) is paramagnetic. |
The correct answer is (1) In oxyhaemoglobin, \(Fe^{2+}\) is paramagnetic. In oxyhemoglobin, the iron ion (\(Fe^{2+}\) ) is diamagnetic, not paramagnetic. In oxyhemoglobin, the iron ion is coordinated to a heme group and binds to oxygen molecules. The binding of oxygen to the iron ion induces the formation of a complex in which the iron ion is in the ferrous (\(Fe^{2+}\)) state. In this state, the iron ion has a fully paired set of electrons and exhibits diamagnetic behavior.
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