Can I become a government teacher in school or colleges in Himachal after doing M.Sc in applied chemistry?

Yes but I think you have to clear NET exam that is National Eligibility Text to become a government appointed teacher or lecturer.

If that's the case, you can actually try for UGC NET exams. It can be done after your post-graduation in any stream with 55% marks. It will be helpful for you.

Hello, If you clear the government exam for teacher's post then you can get teaching jobs.

The requirement of being a school teacher is a B.Ed. So, you can become a teacher after completing your B.Ed. However, if you want to teach in college at a university level, qualification of NET lectureship is mandatory. This exam is conducted twice annually by CSIR/ joint CSIR UGC.