How good is chem engg in IGIT sarang regarding placement? I have option of joining Chemical @ IGIT or CSE at Silicon bbs Suggest me which one to join.

The stream in which you wish to make your career is more relevant than knowing about the college that you choose, as the chief problem is the stream that you choose.

As per the listed choices, it would be better to choose Computer Science from Silicon BBS over Chemical at IGIT. The reason is that the faculty of IGIT Chemical engineering is not very impressive. Most of the teachers there are recent graduates recruited due to a lack of qualified faculties. 

As the campus of IGIT is isolated from the town, very few companies visit there for the campus whereas, Silicon has a location advantage. It is more like a school as it has strict attendance rules. However, their placement record definitely makes up for it.