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Ozone depletion potential (ODP) is the measure of ozone depletion capability of a refrigerant compared to that of
1. R11
2. R718
3. R717
4. R22

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Correct Answer - Option 1 : R11

Ozone depletion potential (ODP)

  • The ozone depletion potential (ODP) of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane (CFC-11) being fixed at an ODP of 1.0.
    • ODP can be estimated from the molecular structure of a given substance.
    • Chlorofluorocarbons have ODPs roughly equal to :
      • Brominated substances have usually higher ODPs in range 5–15, because of more aggressive bromine reaction with ozone.
      • Hydrochlorofluorocarbons have ODPs mostly in range 0.005 - 0.2 due to the presence of the hydrogen which causes them to react readily in the troposphere, therefore reducing their chance to reach the stratosphere where the ozone layer is present.
      • Hydrofluorocarbons (HFC) has no chlorine content, so their ODP is essentially zero.
  • Ozone-depleting substances include:
    • Chlorofluorocarbons (CFCs)
    • Hydrochlorofluorocarbons (HCFCs)
    • Hydrobromoflurocarbons (HBFCs)
    • Halons (any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, etc). Hence, 4 is NOT correct.
    • Methyl bromide
    • Carbon tetrachloride
    • Methyl chloroform
  • HFC, Ammonia, and Carbon dioxide do not cause depletion of Ozone.
    • So they have zero ODP.

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