No, not the ones deployed in an accident.
No, the air bags will not deploy if the ignition is in the off position.
Yes.
yes just wont pass inspection
computer needs to be replaced
Most older car models do not feature an air bag and yet they can be driven legally on the road.
If the seller sold you the car knowing that the air bags had been deployed and then had not replaced you do have legal standing to sue. You would have to be able to prove the seller knew this and did not tell you. That will be very difficult after 10 years. But of course you can sue.
Assuming you mean used air bags that have not deployed, try contacting your local used auto parts dealer (AKA, junk yard, wrecking yard, salvage yard).
Yes you can but in the event of a serious accident your survival rate goes down.
depends on the car
a cheap car :) one you don't care gets dented. any car would do but make it an old car with air bags.
Return it to the dealer for replacement.