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Consider the following statements about the chlorofluorocarbons (CFCs).
1. CFCs molecules are made up of calcium, fluorine and carbon.
2. Unlike other chemicals, CFCs cannot be eliminated from the atmosphere by the usual scavenging processes like photodissociation, rain-out and oxidation.
2. Unlike other chemicals, CFCs cannot be eliminated from the atmosphere by the usual scavenging processes like photodissociation, rain-out and oxidation.
Which of these statements is/are not correct?
- a)1 only
- b)2 only
- c)Both of them
- d)Neither of them
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements about the chlorofluorocarbons (CFCs)...
- CFCs molecules are made up of chlorine, fluorine and carbon. Where it is used? They are used as refrigerants, propellants in aerosol sprays, foaming agents in plastic manufacturing, fire extinguishing agents, solvents for cleaning electronic and metallic components, for freezing foods etc.
- Two-thirds of CFC is used as refrigerants while one-third is used as blowing agents in foam insulation products.
- The residence time of CFCs in the atmosphere is estimated to be between 40 and 150 years. During this period, the CFCs move upwards by random diffusion, from the troposphere to the stratosphere. The escape of CFCs The CFCs enter into the atmosphere by gradual evaporation from their source.
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Community Answer
Consider the following statements about the chlorofluorocarbons (CFCs)...
The correct answer is option 'A' - Statement 1 only.
Explanation:
1. CFCs molecules are made up of calcium, fluorine, and carbon. - Incorrect
CFCs (chlorofluorocarbons) are not made up of calcium. They are compounds composed of carbon, fluorine, and chlorine atoms. The most common CFCs contain chlorine and fluorine, such as CFC-11 (trichlorofluoromethane) and CFC-12 (dichlorodifluoromethane).
2. Unlike other chemicals, CFCs cannot be eliminated from the atmosphere by the usual scavenging processes like photodissociation, rain-out, and oxidation. - Correct
This statement is true. CFCs are known for their stability and resistance to degradation in the atmosphere. They are non-reactive and do not undergo photodissociation or oxidation easily. This means that once released into the atmosphere, CFCs can persist for a long time and can be transported to the upper atmosphere where they can cause damage to the ozone layer.
CFCs were widely used in various applications such as refrigeration, air conditioning, aerosol propellants, and foam blowing agents. However, it was later discovered that CFCs are major contributors to ozone depletion. When CFCs are released into the atmosphere, they can reach the stratosphere where they can be broken down by ultraviolet (UV) radiation from the sun. The breakdown of CFCs releases chlorine atoms, which can then catalytically destroy ozone molecules.
Due to the detrimental effects of CFCs on the ozone layer, the production and use of most CFCs have been phased out under the Montreal Protocol, an international environmental agreement. Alternative substances with lower ozone depletion potential, such as hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs), have been developed and used as replacements for CFCs.
In conclusion, statement 1 is incorrect as CFCs do not contain calcium. Statement 2 is correct as CFCs are resistant to usual atmospheric scavenging processes, making them persistent and capable of causing damage to the ozone layer.
Explanation:
1. CFCs molecules are made up of calcium, fluorine, and carbon. - Incorrect
CFCs (chlorofluorocarbons) are not made up of calcium. They are compounds composed of carbon, fluorine, and chlorine atoms. The most common CFCs contain chlorine and fluorine, such as CFC-11 (trichlorofluoromethane) and CFC-12 (dichlorodifluoromethane).
2. Unlike other chemicals, CFCs cannot be eliminated from the atmosphere by the usual scavenging processes like photodissociation, rain-out, and oxidation. - Correct
This statement is true. CFCs are known for their stability and resistance to degradation in the atmosphere. They are non-reactive and do not undergo photodissociation or oxidation easily. This means that once released into the atmosphere, CFCs can persist for a long time and can be transported to the upper atmosphere where they can cause damage to the ozone layer.
CFCs were widely used in various applications such as refrigeration, air conditioning, aerosol propellants, and foam blowing agents. However, it was later discovered that CFCs are major contributors to ozone depletion. When CFCs are released into the atmosphere, they can reach the stratosphere where they can be broken down by ultraviolet (UV) radiation from the sun. The breakdown of CFCs releases chlorine atoms, which can then catalytically destroy ozone molecules.
Due to the detrimental effects of CFCs on the ozone layer, the production and use of most CFCs have been phased out under the Montreal Protocol, an international environmental agreement. Alternative substances with lower ozone depletion potential, such as hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs), have been developed and used as replacements for CFCs.
In conclusion, statement 1 is incorrect as CFCs do not contain calcium. Statement 2 is correct as CFCs are resistant to usual atmospheric scavenging processes, making them persistent and capable of causing damage to the ozone layer.
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Consider the following statements about the chlorofluorocarbons (CFCs).1. CFCs molecules are made up of calcium, fluorine and carbon.2.Unlike other chemicals, CFCs cannot be eliminated from the atmosphere by the usual scavenging processes like photodissociation, rain-out and oxidation.Which of these statements is/are not correct?a)1 onlyb)2 onlyc)Both of themd)Neither of themCorrect answer is option 'A'. Can you explain this answer?
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