# 11 - Luu (sl24673) H11: Redox Reactions Mccord (52445) 1...

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Unformatted text preview: Luu (sl24673) H11: Redox Reactions Mccord (52445) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points If the oxidation state of H is +1 and O is- 2, what is the oxidation state of C in C 2 H 4 O? 1.- 1 correct 2. +2 3.- 2 4. +1 5.- 1 2 Explanation: To calculate oxidation numbers, remember that the the sum of the numbers must equal the total charge on the molecule or in the case of neutral species, zero. Let x be the oxidation number of C. 2 x + 4(+1) + (- 2) = 0 C 2 H 4 O : 2 x + 2 = 0 2 x =- 2 x =- 1 002 10.0 points What is the oxidation number of carbon in carbonate? 1.- 3 2.- 1 3. +3 4.- 4 5. +1 6.- 2 7. +4 correct 8. 9. +2 Explanation: The carbonate ion is CO 2- 3 . The oxidation number of O is usually- 2, so for three O atoms, we obtain- 6. The overall oxidation number must equal the charge on the ion, so C must have an oxidation number of +4. C- 2 O 3 2- C- 2 O 3- 6 2- C +4- 2 O 3- 6 2- +4 C +4- 2 O 3- 6 2- 003 10.0 points What is the oxidation number of the noble gas in XeO 3 ? 1. 2 2. 6 correct 3.- 4 4.- 6 Explanation: The oxidation number of halogens is -1 (if no other halogens are present). The oxidation number of O is -2 (if no F is present). The sum of all oxidation numbers must equal the sum of the overall charge of the species. For XeO 3 , 0 = x + 3 (- 2) +6 = x 004 (part 1 of 2) 10.0 points What is the oxidation number (state) of I in the compound HIO 4 ? Remember that the oxidation state is associated with a sign; e.g. , +1....
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## This note was uploaded on 12/17/2010 for the course CH 52445 taught by Professor Mccord during the Fall '10 term at University of Texas at Austin.

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11 - Luu (sl24673) H11: Redox Reactions Mccord (52445) 1...

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