Which of the following is not a green house gas ?
Greenhouse Gases Explained
Greenhouse gases are gases in the Earth's atmosphere that trap heat. They allow sunlight to pass through the atmosphere and warm the Earth's surface, but they prevent some of the infrared radiation (heat) emitted by the Earth from escaping back into space. This process is essential for keeping the planet warm enough to support life, but an increase in these gases can lead to global warming.
Analyzing Greenhouse Gas Options
Let's examine each option provided in the question to determine which one does not fit the definition of a greenhouse gas.
Methane ($CH_4$)
Methane is a potent greenhouse gas. Although it is less abundant in the atmosphere than carbon dioxide, it absorbs more heat per molecule. It is released through natural processes like the decomposition of organic matter and by human activities such as agriculture and natural gas production.
Chlorofluorocarbons (CFCs)
Chlorofluorocarbons (CFCs) are synthetic chemicals that were widely used in refrigeration, aerosols, and solvents. They are extremely effective at trapping heat and are considered very powerful greenhouse gases. While their production is now phased out under international agreements due to their ozone-depleting effects, they persist in the atmosphere and contribute to global warming.
Carbon Dioxide ($CO_2$)
Carbon dioxide is the most significant greenhouse gas produced by human activities. It is released through the burning of fossil fuels (coal, oil, and natural gas), deforestation, and industrial processes. Its long atmospheric lifetime and increasing concentration make it a major driver of climate change.
Nitrogen ($N_2$)
Nitrogen gas makes up about 78% of the Earth's atmosphere. Despite its abundance, molecular nitrogen ($N_2$) is not considered a significant greenhouse gas. This is because the $N_2$ molecule is very stable and does not effectively absorb infrared radiation (heat) at the wavelengths relevant to Earth's energy balance. Greenhouse gases typically have molecular structures that allow them to vibrate and absorb energy in the infrared spectrum.
Comparison Table: Greenhouse Gases
| Gas | Chemical Formula | Greenhouse Gas Status |
|---|---|---|
| Methane | $CH_4$ | Yes (Potent) |
| Chlorofluorocarbon | (Various, e.g., $CF_2Cl_2$) | Yes (Very Potent) |
| Carbon Dioxide | $CO_2$ | Yes (Major Contributor) |
| Nitrogen | $N_2$ | No (Not a significant greenhouse gas) |
Based on the analysis, nitrogen ($N_2$) is the gas among the options that does not function as a greenhouse gas.
Important Questions from Environment Problems
Which one of the following is NOT a cause of depletion in groundwater?
The following 6 (Six) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below.
Statement I: Ozone is a triatomic molecule of oxygen.
Statement II: Ozone is concentrated mainly in the stratosphere.
Which one of the following is not a Green House Gas?
Which of the following is NOT a greenhouse gas?
________ is one of the major factor responsible for deforestation.
