PSU you can go for after MSc through GATE:
Mineral Exploration Corporation Ltd. ( Executive trainee chemist) Oil and Natural Gas Corporation (chemist) IOCL ( asst officer quality control ) DRDO ( scientists grade b ) BARC( scientists grade b)
You check the official website of the afore mentioned to know more about them.
I hope my answer helps. All the very best for your future endeavors!
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