Dear Aspirant,

The PSU's which give job of chemist/scientist to a student who has qualified GATE exam under Chemistry category are:

ONGC

IOCL (Ass. Officer quality control with min. 2 years of experience)

DRDO (Scientists Grade B)

BARC (Scientists Grade B)

Cabinet secretariat (Scientists)

MECL

Keep checking the websites of the respective PSU's as they will release the application form in next few months.
Hope this is helpful.
Best Wishes!