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q4f10 - Version PREVIEW Quiz 4 JOHNSON(53140 This print-out...

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Version PREVIEW – Quiz 4 – JOHNSON – (53140) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. LDE Bond Order 005 001 10.0 points All of the species below have the same bond order except for one. Which is it? 1. F + 2 2. Li - 2 correct 3. N 3+ 2 4. C + 2 5. B - 2 Explanation: All of the species have a bond order of 1.5 except for Li - 2 , whose bond order is 0.5. LDE Paramagnetism 004 002 10.0 points Which of the following species is/are param- agnetic? I) Li - 2 II) O 2 III) H + 2 1. I and II 2. I only 3. I and III 4. II and III 5. II only 6. I, II and III correct 7. III only Explanation: Li - 2 and H + 2 both have an odd number of electrons and therefore must be paramag- netic. O 2 has 16 total electrons, the last two of which must go into separate degenerate π * anti-bonding orbitals. LDE Bond Order 006 003 10.0 points Rank the following species from strongest to weakest bonds based on bond order: O 2 , N + 2 , H - 2 , Li 2 , C 2 - 2 .
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