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Hi, It is advisable to go for Masters as post graduation has become a necessary qualification for many government jobs specially if you apply for jobs which required science background. M.Sc. in Environmental Chemistry has lot of scope as Climate Change has become one of the most critical issues for developing as well as developed countries. 
Even after B.Sc. in Chemistry you have multiple opportunities in Public Sector. There are those which require a basic graduation like, SSC, UPSC, Banking etc. If you wish be in jobs which require specialized knowledge in Chemistry or Science I would strongly recommend to look for jobs in Environmental Sector. In addition to this you may also join Education Sector (like Govt college) etc.
The final decision should be based on your interest, aptitude and economic/family circumstances.