Question

Which of the following is not a sink for CO?

• A. Haemoglobin
• B. Microorganims present in the soil
• C. Oceans
• D. None of the above

Answer 1

The correct option is A Haemoglobin

* Incomplete combustion of fossil fuels liberate CO into air. 80% of CO is released from automobiles.

* Permissible level of CO in air is 9 ppm. It reduces $O_2$ supply in human by forming a stable carboxyhaemoglobin.

$2C+O_2\to 2CO$
$2C{H}_4+3O_2\to 2CO+4H_{2}O$

* CO interacts with oxyhaemoglobin ($O_{2}Hb$) and forms carboxyhaemoglobin (CO-Hb) as :

$O_{2}Hb+CO\to COHb+O_2$

* CO has high affinity for haemoglobin than that of oxygen.

Therefore, option A is correct.