with this score u can expect rank 4500 -4600.
In general catagory u will not get chemical engineering in old IITs.
and in new IITs only IIT gandhinagar offer chemical enginnering ,and last year cutt off for this was 2943-3741.
so u have a chance to get chemical eninnering in gandhinagar.
Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed solution very quickly.
We are all IITians and here to help you in your IIT JEE preparation.
All the best.