Assertion :Hb reacts with $O_{2}$ in a way that is remarkable in comparison to other chemical reactions. Reason: Each molecules of iron in Hb can take two atoms of $O_{2}$ at its saturation point.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Haemoglobin has very high affinity for oxygen. When one oxygen binds with one unit in the hemoglobin, it stimulates binding of other units. This positive cooperative binding is achieved through steric conformational changes of the hemoglobin protein complex; i.e., when one sub unit protein in hemoglobin becomes oxygenated, a conformational or structural change in the whole complex is initiated, causing the other sub units to gain an increased affinity for oxygen. The binding of oxygen with Hb is thus, a cooperative process. But in a haemoglobin molecule, one atom of iron carry one molecule of oxygen or two atoms.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'

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Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

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(c) Assertion is correct, but reason is incorrect
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Assertion :Hb reacts with O2 in a way that is remarkable in comparison to other chemical reactions. Reason: Each molecules of iron in Hb can take two atoms of O2 at its saturation point.

Assertion :Hb reacts with $O_{2}$ in a way that is remarkable in comparison to other chemical reactions. Reason: Each molecules of iron in Hb can take two atoms of $O_{2}$ at its saturation point.