mai i do MSC(chemistry) after bsc(math)
Hello Abhishek
As regards to your question,opting for MSc Chemistry would only be a great option if you have a long term goal, making a career in chemistry and it depends upon your own interest area and your capibility, so that you can Excel in the career in chemistry further
If you wish to Change, it's your call and you should always follow what you like to do
Wishing you best future !!!