Which of the following is not a sink for CO?

Haemoglobin

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Microorganims present in the soil

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Oceans

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None of the above

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Solution

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.

$2 C + O_{2} \to 2 C O$
$2 C H_{4} + 3 O_{2} \to 2 C O + 4 H_{2} O$

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

$O_{2} H b + C O \to C O H b + O_{2}$

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

Therefore, option A is correct.

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