You may pursue MS in Chemistry/Chemical Science from US after B.Sc in India, perhaps you may not be able to attain Funding/Scholarship for Graduate Study. Assuming you are a Middle Class Aspiranr, best option for you would be to pursue Direct PhD or pursue M.Sc from some of the Top IITs in India followed by PhD in US. A Doctorate Study in US, at most of the Universities is fully funded, besides the fact you get a stipend, accomodation allowance as well as free health insurance. Secondly, M.Sc from IITs will really make you more inclined towards research than most Public Universities in India, and also provide you with a Ecosystem of Students studying for GRE/IELTS/Preparing their Profile/ Projects & Internships, for pursuing Doctoral Degree Abroad, from across Departments. Secondly, as far as Job Prospects in Chemistry/Basic Sciences are concerned, the best Country you should target is United States, and you must aspire a PhD there. However there are other Countries like Germany, Singapore, Australia, Canada and UK, where there are somewhat better prospects.

Besides GRE/IELTS for US, UK Universities you may even prepare for GATE Chemistry. Some of the Top Universities like NUS Singapore, NTU Singapore as well as RWTH Aachen and TU Munich Germany have started accepting GATE Score for Graduate/Doctoral Admissions.

For more information about Study Abroad, Courses, Scope do follow the link below

https://www.careers360.com/articles/study-abroad-countries-courses-tests-visas-more/amp