is it possible to re-use granite countertop when i am replacing cabinets in my kitchen? or is there a high chance of breaking it?
Yes, it's possible & common. Cut any caulking clean through with a knife & slide it free, never pry up to free it. For solid sections you can just move those around carefully as-is. For sections that have a sink or cooktop cut-out, you'll want to sandwich the front edge by clamps or screws with 2x4's or wider. Slide the front edge out enough to sandwich that in place, then you can tip it up & move it to another room where you'll store it tipped up & not flat.