Question
Which of the following has the lowest Ozone depletion potential ?
The correct answer is
HCFC – 123
Understanding Ozone Depletion Potential (ODP)
Ozone Depletion Potential (ODP) is a relative measure of a substance's ability to destroy the ozone layer compared to a reference substance (CFC-11, which has an ODP of 1.0).
Comparing ODP Values
Different halogenated hydrocarbons have varying ODPs:
- CFC-12: Has an ODP of approximately 1.0. It was widely used but is now phased out due to its high ODP.
- Halon-1211: Used in fire extinguishers, it has a very high ODP, ranging from 3.0 to 5.0.
- HCFC-22: A hydrochlorofluorocarbon with an ODP of about 0.055. While lower than CFCs, it still contributes to ozone depletion.
- HCFC-123: Another hydrochlorofluorocarbon, specifically designed as a lower-ODP alternative to some CFCs. Its ODP is approximately 0.02.
Identifying the Lowest ODP
Comparing the approximate ODP values:
- HCFC-123: 0.02
- HCFC-22: 0.055
- CFC-12: 1.0
- Halon-1211: 3.0 - 5.0
Based on these values, HCFC-123 exhibits the lowest Ozone Depletion Potential among the choices.
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Important Questions from Global Environmental Issues
- The Green Climate Fund recently set up to help poor countries adapt to climate impacts envisages financial support to the extent of (in $ per year)
- Stratospheric ozone absorbs UV radiations principally in the wavelength range
- Which one of the following international events was not related to climate change ?
- Major focus of Environment Conference Rio-92 was on :
- With reference to pre-industrial times, the present day average global surface temperature is higher approximately by :
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