good morning riddhi tripathi!!
as oer the last years cutoff marks for MSC CHEMISTRY In NIT ROURKELA, the closing score after round 3 is 54.67

basing on that it might be difficult for you to get a seat there,but it is just an analysis trend but not final.

cutoffs change every year.lets hope for the best

please see the following link for more details of cutoffs after the 3rd round :

https://images.careers360.mobi/sites/default/files/CCMN-Closing-Score-Round-3_2018.pdf

thank you