Doubt Clearance Thread: UPSC 2021

Hey guys! 

Slightly deviating from the topic. Can anyone suggest me how to improve efficiency in initial stage of the exam i.e., Out of the first 10 questions i am constantly making 6-7 errors and some times even more. My overall negatives are around 28. Thanks in advance.

hey! Few thumb rules about global warming and ozone depletion.

Global warming Potential depends on:

1.how long it remains in the atmosphere (its “lifetime”).

2.how much radiation it absorbs.

ozone depletion depends on:

1.How easily can the hydrocarbon release a halogen ion(Cl, F) into the atmosphere i.e., how unstable the hydrocarbon is.(halogens react with Ozone to deplete it).

So now to answer your question, HFCs are so stable that they literally release 0 fluorine ions. Instead they remain in the atmosphere for longer time and absorb much radiation.  HCFCs are less stable compared to HFCs so Vice versa.

PS: Florine atoms are small hence less repulsions in HFC and hence are stable. Hope you can see through it now.