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Home Questions 8VTGYUSKQC
Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

Which of the following statements is not correct?

Options:

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.

Correct Answer:

In oxyhaemoglobin, \(Fe^{2+}\) is paramagnetic.

Explanation:

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.

Diamagnetic substances have all their electrons paired and are not attracted to an external magnetic field. In the case of oxyhemoglobin, the ferrous iron ion (\(Fe^{2+}\) ) is diamagnetic due to the presence of paired electrons.

Therefore, the correct statement will be:  in oxyhemoglobin, \(Fe^{2+}\) is diamagnetic. Rest of the statements are correct.

 

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