11. Which of the following sets of quantum numbers are not allowed?(A) n=3, l=2, ml=0 (B) n=4, l=2, ml=1 (C) n=1, l=1, ml=1 (D) n=2, l=1, ml=0

13. When an hydrogen electron makes transition from n = 2 to n = 1, which of the following statements is (are) true? I. Energy is emitted.II. Energy is absorbed. III. The electron loses energy. IV. The electron gains energy. V. The electron cannot make this transition. (A) II, III (B) V (C) I, III (D) II, III