You're right that it can be used for animate and inanimate objects. However, your sentences have some problems. Please see my comments/amendments above.
Originally Posted by Ju
For your first example, I would probably use "Who is the most outstanding student in this group?" or "Who are the most outstanding students in this group?"
"Who" replaces "Which student".
Last edited by emsr2d2; 07-Oct-2012 at 15:58.
Reason: Missed info
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.