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Consider the following statements regarding Hydrofluoroolefins (HFOs):
They have zero ozone depletion potential.
They have iow global warming potential.
They have shorter tropospheric lifetimes compared to HFCs.
Which of the statements given above are correct?
- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements regarding Hydrofluoroolefins (HFOs)...
- Hydrofluoroolefins (HFOs) are unsaturated organic compounds composed of hydrogen, fluorine and carbon. These organofluorine compounds are of interest as refrigerants. Unlike traditional hydrofluorocarbons (HFCs) and chiorofluorocarbons (CFCs), which are saturated, HFOs are olefins. HFO refrigerants are categorized as having zero ozone depletion potential (ODP). Their quick reactivity prevents them from reaching the stratosphere and participating in the depletion of good ozone. So, statement (1) is correct.
- They have low global warming potential (GWP) and offer a more environmentally friendly alternative to CFC, HCFC, and HFC refrigerants. So, statement (2) is correct.
- Compared to HCFCs and HFCs, HFOs have shorter tropospheric lifetimes due to the reactivity of the C=C bond with hydroxyl radicals and chlorine radicals. Many refrigerants in the HFO class are inherently stable chemically and inert, non-toxic, and non-flammable, or mildly flammable. So, statement (3) is correct.
Therefore, the correct answer is d.
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Community Answer
Consider the following statements regarding Hydrofluoroolefins (HFOs)...
Explanation:
Hydrofluoroolefins (HFOs) are a type of chemical compound that have gained attention in recent years as a potential alternative to hydrofluorocarbons (HFCs) due to their lower environmental impact. Let's analyze each statement individually to determine their correctness:
1. They have zero ozone depletion potential:
- This statement is correct. HFOs do not contain chlorine or bromine atoms, which are known to deplete the ozone layer. Therefore, they have zero ozone depletion potential.
2. They have low global warming potential:
- This statement is correct. HFOs have significantly lower global warming potential (GWP) compared to HFCs. GWP measures the ability of a greenhouse gas to trap heat in the atmosphere over a specific period of time, relative to carbon dioxide. HFOs have GWPs that are several orders of magnitude lower than HFCs, making them more environmentally friendly.
3. They have shorter tropospheric lifetimes compared to HFCs:
- This statement is correct. Tropospheric lifetimes refer to the length of time a substance remains in the lower atmosphere, where it can contribute to pollution and climate change. HFOs have shorter lifetimes compared to HFCs, meaning they break down more quickly in the atmosphere and have less time to cause harm.
In conclusion:
All three statements regarding HFOs are correct. They have zero ozone depletion potential, low global warming potential, and shorter tropospheric lifetimes compared to HFCs. These characteristics make HFOs a promising alternative to HFCs in various applications, such as refrigeration and air conditioning, where reducing environmental impact is a priority.
Hydrofluoroolefins (HFOs) are a type of chemical compound that have gained attention in recent years as a potential alternative to hydrofluorocarbons (HFCs) due to their lower environmental impact. Let's analyze each statement individually to determine their correctness:
1. They have zero ozone depletion potential:
- This statement is correct. HFOs do not contain chlorine or bromine atoms, which are known to deplete the ozone layer. Therefore, they have zero ozone depletion potential.
2. They have low global warming potential:
- This statement is correct. HFOs have significantly lower global warming potential (GWP) compared to HFCs. GWP measures the ability of a greenhouse gas to trap heat in the atmosphere over a specific period of time, relative to carbon dioxide. HFOs have GWPs that are several orders of magnitude lower than HFCs, making them more environmentally friendly.
3. They have shorter tropospheric lifetimes compared to HFCs:
- This statement is correct. Tropospheric lifetimes refer to the length of time a substance remains in the lower atmosphere, where it can contribute to pollution and climate change. HFOs have shorter lifetimes compared to HFCs, meaning they break down more quickly in the atmosphere and have less time to cause harm.
In conclusion:
All three statements regarding HFOs are correct. They have zero ozone depletion potential, low global warming potential, and shorter tropospheric lifetimes compared to HFCs. These characteristics make HFOs a promising alternative to HFCs in various applications, such as refrigeration and air conditioning, where reducing environmental impact is a priority.
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Consider the following statements regarding Hydrofluoroolefins (HFOs): They have zero ozone depletion potential. They have iow global warming potential. They have shorter tropospheric lifetimes compared to HFCs. Which of the statements given above are correct?a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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