The main objective is to have a good conversation and highlight your intellectual capacity and curiosity. Thus:
It is ok to ask:
It's not ok to ask:
Be prepared and good luck!
Here are some great answers to that question:
Ideally, there are questions hat could show your intrinsic interest in the company, person, or both ideally. So one of the greatest question could be for example the following:
"Now, look at your career XX long, what is the one project assignment, by looking back, makes you very proud of accomplishing smth great?"
Hope it helps,