Hello
With 2543 rank in JAM 2020 and OBC category your chances of getting any IIT are almost nill. Because seats of IITs for chemistry are filled by about 900 ranks.
However you might get NITs such as: NIT Silchar for Applied Chemistry and other lower ranked NITs.
You might also opt for the private colleges taking JAM marks.

Follow this link for more information
https://www.google.com/amp/s/university.careers360.com/articles/ccmn-cutoff/amp

Good luck

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