What is better, IIT BHU civil or chemical ?

The answer to this question depends on what you aim for after 4 or 5 years of your college degree. If you just want a placement and not particularly interested in a branch then you could go for any of those two branches as placement statistics are good for both in IIT BHU. There are enough opportunities in the non-core sector which generally comprise IT, developer, analytics, product management, business analyst, etc. These sectors don't look for a specific branch and rather require good communication and analytical skills. 

Coming to the core sectors, both civil and chemical provide diverse opportunities in these areas. If you are someone who finds chemical processing and chemistry interesting, then go for chemical engineering. If you are the one who gets amazed by the interesting and defying structures, civil engineering should be your choice. According to 2019 placement statistics, 77 students from Civil Engineering and 104 students from Chemical Engineering got placed from IIT BHU.

Opting for civil engineering would open doors to exams such as IES, UPSC, GATE, and other state engineering exams. There are ample opportunities for civil engineering majors. And if you choose chemical engineering, you can go for higher studies or work for PSUs. So, both these branches at IIT BHU would provide enough opportunities to grow and explore and the end decision should be based on your interest.