page 02 SECTION 1 — 25 marks Attempt ALL questions 1. Which of the following statements about atomic emission spectroscopy is not correct? A Each element has a characteristic spectrum. B Visible light is used to promote electrons to higher energy levels. C The lines arise from electron transitions between one energy level and another. D The quantity of the element can be determined from the intensity of the radiation emitted. 2. How many electrons are there in the highest energy subshell of a Cr+ ion, in its ground state? A 1 B 2 C 4 D 5 3. The formula of an octahedral complex ion containing a metal ion, M2+, and the bidentate ligand, L−, is: A [ML2]− B [ML2]2+ C [ML3]2+ D [ML3]− 4. Which of the following statements about heterogeneous catalysts is not correct? A They are found in the same state as their reactants. B They adsorb reactive molecules onto their active sites. C They provide reaction pathways with lower activation energies. D They have unpaired d electrons that allow activated complexes to form.