neutral is a ground so yes they will work on 110v....220v needs a ground to work....
Funny side note about grounds. I worked with this 'electrician' who firmly believed you don't need a ground wire because the neutral goes to the same place. I found so many outlets that he jumped from ground to neutral to fool the testers. Nearly everything was in conduit so pulling that extra wire wasn't a problem.
OK, so maybe not funny...