Hemoglobin is an oxygen carrying. The correct statement about oxy̵...
Hemoglobin is a protein found in red blood cells that carries oxygen from the lungs to the body's tissues and
returns carbon dioxide from the tissues to the lungs. Hemoglobin contains a heme group, which is a complex of iron
and porphyrin. When oxygen binds to the iron in heme, it forms oxyhemoglobin.
The correct statement about oxyhemoglobin is that the metal is lowspin in 3 oxidation state while dioxygen is in
02- form. Let's break this down:
Metal is lowspin in 3 oxidation state:
- The iron in heme is in the +2 oxidation state when it is not bound to oxygen.
- When oxygen binds to iron, it becomes oxidized to the +3 oxidation state.
- In the lowspin state, the electrons in the iron atom pair up in the d-orbitals, resulting in a lower magnetic moment.
Dioxygen is in 02- form:
- When oxygen binds to iron, it accepts two electrons from iron to form a peroxide bond.
- This results in the formation of 02-.
So, the correct statement is that the metal (iron) in oxyhemoglobin is lowspin in the +3 oxidation state, while
dioxygen is in the 02- form.
In summary, the correct answer to the question is option 'A'.