Which of the following is a sink for CO?

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Question

Which of the following is a sink for CO?

Accepted Answer

Correct Answer: C — Micro-organisms present in the soilStep-by-step Solution:A 'sink' in environmental chemistry refers to a process, system, or reservoir that absorbs and removes a pollutant from the atmosphere.Certain soil micro-organisms (bacteria) are capable of metabolizing carbon monoxide, oxidizing it or using it in biological processes. This makes the soil a significant natural sink for atmospheric CO, helping to regulate its concentration.Why other options are incorrect:Haemoglobin binds CO very strongly (forming carboxyhaemoglobin), but this is a health hazard, not a sink that removes CO from the environment.Plants are a sink for CO2 (via photosynthesis), not for CO.Oceans absorb CO2 efficiently but are not a significant sink for CO.Key Concept: Carbon monoxide (CO) is a primary air pollutant produced by incomplete combustion. Natural sinks for CO include soil microorganisms and certain chemical reactions in the troposphere (reaction with OH radicals to form CO2). CO is toxic because it binds to haemoglobin with about 200 times higher affinity than O2.

Which of the following is a sink for CO?

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Which of the following is a sink for CO?

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