#Question id: 40483
#Applied Microbiology
While HFCs (Hydrofluorocarbons) were introduced to replace CFCs because they do not deplete the ozone layer, they are still problematic. Why?
#Question id: 40484
#Applied Microbiology
Read the following statements regarding the breakdown of the ozone layer:
Statement I: UV radiation acts upon Chlorofluorocarbons (CFCs) in the stratosphere to release active Chloride radicals.
Statement II: A single Chlorine radical is consumed after destroying one Ozone molecule and cannot participate in further reactions.
Which of the options is correct?
#Question id: 40485
#Applied Microbiology
Consider the following statements about the "Ozone Hole":
It is most prominent over the Antarctica region.
It forms primarily during the late winter and early spring.
The formation of Polar Stratospheric Clouds (PSCs) facilitates the depletion process.
Which of the statements given above are correct?
#Question id: 40486
#Applied Microbiology
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The thickness of the ozone layer is measured in Dobson Units (DU).
Reason (R): The ozone layer is found in the Troposphere and protects us from harmful UV-B radiation.
#Question id: 40487
#Applied Microbiology
Match the Chemical/Term (List I) with its description or impact (List II).
| List I (Term) | List II (Description) |
| A. CFCs | 1. Replacement for CFCs; zero ODP but high GWP. |
| B. HFCs | 2. Used in fire extinguishers; contains Bromine which depletes ozone. |
| C. Halons | 3. Major ODS used in refrigerants; releases Chlorine. |
| D. UV-B | 4. Radiation absorbed by the ozone layer; causes skin cancer. |
#Question id: 40488
#Applied Microbiology
The water activity (aw) of pure water is equal to: