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MT 2010 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, circle the letter that corresponds to the best answer. There is only one correct answer per question. Each question answered correctly is worth 2 marks. 1. Which of the following compounds has a non-hydrogen atom that does not obey the octet rule? (a) arsenic trichloride (b) carbon dioxide (c) sulfur hexafluoride (d) ammonia (e) hydrazine (N 2 H 4 ) 2. Arrange the following species in order of increasing size: K, As 3+ , Ge + , Ga + 3. Which one of the following statements is true? 4. What is the oxidation state of Cr in (NH 4 ) 2 Mg(CrO 4 ) 2 ·6H 2 O?
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Page 2 of 8 5. Which of the following elements has 4 neutrons in the nucleus of its most abundant isotope? (a) He (b) Li (c) Be (d) B (e) C 6. Molecules that have this shape are always polar. 7. Which of the following is expected to exist as an isolable molecule?
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Page 3 of 8 Part 2. Short Answer Questions 1. For this question, consider only the following elements as possible answers: Li, Na, K, Rb, Cs Be, Mg, Ca, Sr, Ba For each part, give the symbol from the above list that makes the statement correct.
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