a. In which of the following reactions does the oxidation number of carbon show the greatest increase? A. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) B. C(s) + O2(g) → CO2(g) C. 2CO(g) + O2(g) → 2CO2(g) D. CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H2O(l) b. In which of the following changes is chlorine reduced? A. HCl to Cl2O B. HCl to HClO3 C. Cl− to Cl2 D. Cl2 to HCl

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter3: Chemical Reactions
Section3.8: Oxidation-reduction Reactions
Problem 2RC
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a. In which of the following reactions does the oxidation number of carbon show the greatest increase?
A. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
B. C(s) + O2(g) → CO2(g)
C. 2CO(g) + O2(g) → 2CO2(g)
D. CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H2O(l)

b. In which of the following changes is chlorine reduced?
A. HCl to Cl2O
B. HCl to HClO3
C. Cl− to Cl2
D. Cl2 to HCl

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