Greetings, Amit.

Which job post are you referring to exactly? do specify so that I may be able to help you better.

So, in general, if you are applying for an exam (GATE) then they usually do not have any such criteria for percentage in B.Tech as long as you have passed and have a great score in GATE (for appearing in exams). If you are applying for a specific post in  a company without any exams then every company has its guidelines and eligibility criteria for applying which usually ranges from passed with 2nd division or as high has merit based with 70% and +

so do check out the criteria for the place you are applying at or ask with specific details here on the site.

here is  a link to GATE chemical ENGG cut offs :

https://engineering.careers360.com/articles/gate-cutoff-for-ch

Good day!