Please opt for dual degree in chemical engineering in IIT Kharagpur. The department has had excellent placements, has great research opportunities and the scoring in this department is also very easy. Moreover, you will be left with ample time to participate in extra academic activities and hence develop a good overall personality. Also, department changing is pretty easy in IIT Kharagpur and nearly 80 students get an oppotunity to change departments every year. Hence, there is a chance you could change into better departments at the end of your first year.
Kishan S Srinivas