Cats can eat rice if you let them, but it holds absolutely no nutrition at all.
seriously...I have no clue
You can smell it. If it smells rancid, you may want to replace it.
No. Some pathogens produce toxins that are not destroyed by heating.
No. Never Well, I'm not sure. It might not be very good. -- It would be fine to eat, because rice is a nonperishable good.