What is Yaumul Qiyamah mentioned in 2:85? Why is it also mentioned in the same verse the term Akhirah?
Qiyamah (lit. standing) refers to the Day of Judgment; more specifically it refers to the standing that all humans will be doing on that day. Some will have it comfortable and it will seem like a breeze, and to others it will be a painful torment.
Akhirah refers in general to the world of the Hereafter, which begins with the Day of Judgment.