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Question

Haemoglobin shows maximum affinity with

A
Carbon monoxide
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B
Carbon dioxide
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C
Oxygen
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D
Ammonia
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Solution

The correct option is C Carbon monoxide
Haemoglobin shows maximum affinity with carbon monoxide as compared to coarbon dioxide and oxygen. When compared with carbon dioxide, haemoglobin has more affinity with oxygen. When haemoglobin binds with carbon monoxide, it forms carboxyhaemoglobin. It gives bright red color to the blood.
Thus, the correct answer is 'Carbon monoxide.'

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