Science

There are many courses that you can do after your B.Sc. -You can do Masters in any of the subject and start preparing for NET/SLET and become a lecturer in any of the college in India. -If you do not want to do Masters then you can go for B.Ed course and become a teacher and start your career. -You can work for any cement company or any production company as a chemist. -You can also prepare for government. Exam like bank, SSC and start your career. -Higher exam preparation is also an option like IAS, IPS AND IFS. -You can do MBA and start your career as a manager in any of the field you wanted to get in. These are the options available in front of you. Now, to answer your second question; you can do Masters in any other subject after B.Sc. So if you want to go with that then also you can go.

There are better scope in terms of employment if you like to say - then it is undoubtedly chemistry as chemical Industries, Industries based on chemical products worldwide are innumerable and it is increasing. So, there are always requirements of professionals in the chemical domains like paints, polymers, pharmaceuticals, fertilizers etc. Other subjects as you mentioned have opportunity too and may appear boon to individual depending on one's interest and degree of aspiration. Last but not the least, in Education domain, all the subjects require efficient teachers and instructors - and if anyone interested in teaching domain he may feel free to choose a subject based on his interest to give his best output for the development of his Nation based on HR. Best wishes.