Hey Gayathri.

For admission in MSc Chemistry through IIT JAM the eligibility criteria laid down for admission in this course, requires you to study Chemistry for three years/six semesters in your Bachelors degree and also study Mathematics as a subject in Class 12th. Hence you need to have studied Chemistry in your Class 12th. You don't seem to be eligible. You can use the link below to see the eligibility criteria for various courses under IIT JAM.

Https://www.google.com/amp/s/university.careers360.com/articles/jam-eligibility-criteria/amp

Best of luck