The correct answer is option (a) Carbon dioxide.
What is greenhouse gas?
- The gases which are responsible for green house effect is called greenhouse gas.
- The greenhouse gases includes, carbon dioxide, Methane, Nitrous oxide, Water vapor, Fluorinated gases.
- Greenhouse gases have different chemical properties and are removed from the atmosphere, over time, by different processes.
- Average lifetime in the atmosphere of the different green house gases may vary few week to many years or decades.
Why other options are incorrect?
Option (B) and (C) methane and nitrous oxide is incorrect because it will remains in the atmosphere for some period of time up to 28 - 40 and 276 - 300 (app.) respectively. So, this options are incorrect.Option (D) is fluorinated gases, which is varies in time from week to years but highest is sulfur hexafluoride, which is calculable contrasting with carbon dioxide which is not calculable. Option (A) is carbon dioxide which is the longest time remains in the atmosphere because the time which is not calculable something around few weeks to the thousands of years.
So, option (A) is the correct answer that carbon dioxide has an average lifetime in the atmosphere of a few weeks to thousands of years.
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