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Unformatted text preview: krohn (tek335) H11: Redox Reactions Mccord (52445) 1 This printout should have 15 questions. Multiplechoice 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. 1 2 3. +2 4. 2 5. +1 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. +4 correct 2. 3 3. 4 4. +3 5. 2 6. 1 7. 8. +2 9. +1 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 4 6 ? 1. 8 correct 2. 2 3. 6 4. 3 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 4 6 , 4 = x + 6 ( 2) +8 = x 004 (part 1 of 2) 10.0 points What is the oxidation number (state) of S in the compound H 2 SO 3 ? Remember that the oxidation state is associated with a sign; e.g. ,...
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This note was uploaded on 10/25/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Holcombe
 Reaction, Redox

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