Electronic Configuration, Oxidation States — Prelims Questions

Which of the following statements about the oxidation states of Group 16 elements is INCORRECT?

Which of the following elements in Group 16 cannot exhibit a +6 oxidation state?

What is the oxidation state of sulfur in $\text{H}_2\text{SO}_4$?

Which of the following electronic configurations represents a Group 16 element?

In which of the following compounds does oxygen exhibit an oxidation state of -1?

Which of the following statements correctly explains why sulfur can form $\text{SF}_6$ but oxygen cannot form $\text{OF}_6$?