MT 1 - 2011 ANS

MT 1 - 2011 ANS - Page 1 of 8 ANSWER KEY Part 1 Multiple...

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Page 1 of 8 ANSWER KEY Part 1. Multiple Choice (14 marks total) For each numbered statement below, write the letter that corresponds to the best answer. There is only one correct answer per question. Each question is worth 2 marks. 1. When sodium burns in air with excess oxygen, it gives a product that (a) dissolves in water to give an acidic solution (b) has a covalent Na-O bond (c) is stabilized by a triple bond (d) has oxygen in the ±1 oxidation state (e) contains sodium in the +2 oxidation state 2. Which one of the following series has four atoms or ions that are isoelectronic? (a) C, Si, Ge, Sn (b) C 4+ , Si 4+ , Ge 4+ , Sn 4+ (c) B, C, N, O (d) B 2+ , C + , N, O ± (e) None of the above 3. Which one of the following statements is false? (a) the first ionization energy of bromine is larger than that of calcium (b) the first ionization energy of barium is smaller than that of magnesium (c) in a given row in the periodic table, the alkali metal always has the largest first ionization energy (d) the melting points of the alkali metals decrease as their atomic weights increase (e) the second ionization energy of an element is always greater than the first ionization energy 4. In which one of the following species does N have a +1 formal charge in the best Lewis structure? (The underlined atom is the central atom.) (a) HCN (b) ONCl (c) [NBCl] ± (d) NI 3 (e) N 2 O Answer: D Answer: E Answer: C Answer: E
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Page 2 of 8 5. Bromine, with an atomic weight of 79.90 g mol -1 , has only 2 stable isotopes. One isotope of bromine, present in 50.7% natural abundance, has 44 neutrons in its nucleus. The other stable isotope of bromine is: (a) 78 Br (b) 79 Br (c) 80 Br (d) 81 Br (e) 82 Br 6. Which of the following compounds has an unpaired electron? (a) SF 5 (b) SiF 4 (c) IF 5 (d) HNO 3 (e) NaClO 4 7. Which one of the following molecules could exist in both polar and non±polar forms, depending on the arrangement of the halogen atoms? (the underlined atom is the central atom) (a) XeFCl (b) XeCl 2 F 2 (c) SiCl 2 F 2 (d) SCl 2 F 2 (e) PCl 2 F Answer: B Answer: D Answer: A
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MT 1 - 2011 ANS - Page 1 of 8 ANSWER KEY Part 1 Multiple...

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