Question

The plot showing the magnetic behavior of oxy- (solid line) and deoxy-haemoglobin (dashed line) is 

 

• A. (A)
• B. (B)
• C. (C)
• D. (D)

Hint:

Oxy-hemoglobin is paramagnetic due to the binding of oxygen, while deoxy-hemoglobin is diamagnetic due to its iron in the low-spin state.

Answer 1

The Correct Option is A

Step 1: Understanding the magnetic behavior.
Oxy-hemoglobin (HbO₂) and deoxy-hemoglobin (Hb) exhibit different magnetic properties. Oxy-hemoglobin binds oxygen, which results in a paramagnetic behavior due to the iron (Fe²⁺) in its high-spin state. Deoxy-hemoglobin, however, is in the low-spin state and is diamagnetic. The plot of the molar magnetic susceptibility (χ) versus temperature (T) shows the different magnetic behaviors of both forms.

Step 2: Analyzing the options.
(A), (B), (D): Incorrect, as they do not correctly represent the magnetic behavior of oxy- and deoxy-hemoglobin.
(C) Correct: The graph in option C shows the correct trend of paramagnetism for oxy-hemoglobin and diamagnetism for deoxy-hemoglobin.

Step 3: Conclusion.
The correct answer is (C).