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[ Official ] How was the Prelims 2021 paper?

Being a super veteran I can assure u that this was the toughest prelims after scheme got changed in 2013. And this is the peak that can be achieved by UPSC. Now onwards things will be like this or get moderate. I can say with my experience that cutoff will be around 85.
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Carbon monoxide answer will be most probably 2&3 only because u people are focusing on word “MAY” only and not on word “LETHAL”. If I say may release than even .00001ppm makes it right but if I say may release lethal than it must breach lethal amount which is not the case

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@sunnyleony that statement of 2019 paper says- poultry industry releases reactive N2 
And therefore this was right and I was also right. If it would have said releases lethal reactive N2 than it must breach that lethal amount which makes it wrong. 
I hope u understand the word lethal. 🙂


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@Captainnerd 150 ppm is too much amount and that too for sustained period of time. I don’t think 1 or 2 cases will make it a  general rule.


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@Qwertie most probably 


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@srivalliguru940 u just check the differenc between word MAY and MIGHT


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@toooldtodieyoung 😂😂😂😂
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I just can’t understand the delay in IFoS result
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