It is not clear who is your employer. It is not clear if CCS(Pension) Rules apply to you. But while on any kind of leave (padi/unpaid) you continue to be in service for all practical purposes including the notice for VR.
I am working in dept of space govt of india trivandrum as a group A officer. CCS pension rules are applicable. I have completed 25 years of service as on 23-12-2010. I have completed 49 years as on 29-7-2011. meanwhile I had joined duty on 5-9-2011 and again took eol on medical grounds from 12-9-2011. my leave expires on 30-11-2011. please give me a reply.