Should a fresher reveal his placement status to another prospective employer?

#-Link-Snipped-# That's a really interesting question you've asked. 

First things first, don't make the mistake of adding it on your resume or mentioning it to the interviewer in the first round. If you do that, it gives out a negative image and can even be considered unprofessional.

I believe the best idea is to let the HR team know about this in the last round, if they suggest that you are selected.

Most colleges across India have the policy of not letting the students already placed, appear for campus placement offers of another company, which is a little sad, because often a better company can visit your college after you have been placed somewhere else. 

This trick or desperate mechanism is used by the college authorities to try and achieve a 100% placement record.

But if you are one of the lucky ones, where the college authorities let you appear for the placement procedures of multiple companies, I think it is best to reveal your past offer only in the HR round. There will be mostly be a salary negotiation question in the HR round if the company people know that you may have other pending offers. So, that's the best time to pitch in.

Hope this helps you. :) :)