Dear Aspirant 

First of all Congratulating you on your nice performance that you deserve both of the nice college and I would like to tell you that based on three choices if you were to take my opinion then I would suggest you to take admission in chemical engineering at iit Bombay because it is most prestigious college in the country unlike iit bhubaneswar. But if you are interested in metallurgy then iit Kharagpur is also a better place than iit bhubaneswar. So choose smartly considering my views.

Good luck for your future :) 

Feel free to ask if you have any further queries.