Wholehearted congratulations to you Kajal for such high marks you scored in class 12. You want to apply for B.Sc in Chemistry which is indeed a good choice. Nowadays chemistry has a broad scope with further streamlining in MSc in Organic Chemistry. A strong foundation in Organic Chemistry will pave a path for you to work in many govt. research organisations like CSIR Labs in India. 
Qualifying NET, you can be a professor in colleges.