In following picture you can see two links saying Unanswered. Are they both same? Whats the difference in them? When I click on them saw different results.
The top is link to the Unanswered questions list.
The bottom is meant to sort the existing list (whatever it is) showing only unanswered questions.
Just rephrasing the other answers. :)
The top one is for all unanswered questions.
The bottom one is for all unanswered questions in your current context. So if you're viewing a tag, it will show you the unanswered questions for that tag.