which exam have to be given for proffesary in chemistry

Are you asking about how to become a professor in Chemistry?

You'll need a Ph.D. (Doctor of Philosophy) to become a chemistry professor at a college or university. This process begins with the completion of a Bachelor of Science in Chemistry, a 4-year degree program that consists of a combination of chemistry and lab courses and studies in mathematics and physics. You could also choose a concentration area like biochemistry, forensics, pre-law or business and industry.

Your next step is to enroll in a Master of Science (M.S.) or Ph.D. program. While some schools admit candidates with bachelor's degrees into Ph.D. programs, others require prospective students to have master's degrees. An M.S. program will take about two years to complete, and it consists of classroom and lab courses, comprehensive examinations and a final thesis project. The intense research studies could prepare you for a rigorous, research-oriented Ph.D. program.

Good Luck!!