Is there any scholarship provided by the NIT INSTITUTE for pg courses say ...msc chemistry....if so what are the terms and conditions...
If yes, then there a number scholarships available by the MHRD department of government of India.
Every scholarship has a different criteria. Some are only for girls or PD students.
Kindly have a look at this and choose the one which is for you.
https://scholarships.gov.in/#
Also ,refer this link for the various scholarships for Pg courses and the eligibility criteria.
https://www.google.co.in/amp/s/www.shiksha.com/science/articles/amp/popular-bsc-msc-scholarships-in-india-blogId-13494

There are few scholarships for weaker sections or certain categories. That has their own eligibility criteria.
As for NIT there might be some scholarships available but state might or might not be the criteria to avail that.
That was for graduation.
NIT scholarship