Well i suggest you to go for MSC CS because you will get ample of job opportunities compared to MSC in chemistry some of them are-

1. IT/Software companies

2. Indian Agricultural Statistics Research Institute (IASRI)

3. National Institute of Electronics & Information Technology (NIELIT)

4. CDAC

5. BECIL

6. Academic Institutes

7. Ministry of Statistics and Programme Implementation

so if you pursue MSC in computer science you will have a chance to explore more fields with handsome salary.

if you do MSC in chemistry there are also some good sectors where you can go like-

1. chemist

2. Teacher

3. Lab chemist

4. Chemical Engineering Associate

Salary of both depends upon which sector you are going and in which job role you offered.

See both fields are good just pursue your passion that what matters.

Hope it helps!

Good luck!