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1. The oxidation number of carbon in C₂04²* is A) +3 B) +4 C ) +5 2. Consider the following reaction: 3As2O3 + 4NO3 + 7H₂O The oxidizing agent is A) H B) H₂O C) NO3 3. Which of the following represents a redox reaction? A) H₂CO3 H2O + CO2 C)AgNO3 + NaCl → AgCl + NaNO3 → A. Fe B. CO 4.An oxidizing agent will cause which of the following changes? A) PtO2 PtO B) PtO3 → PtO₂ C) Pt(OH)2 → Pt 5. The following represents the process used to produce iron from iron III oxide: Fe2O3 + 3CO → 2Fe + 3CO2 What is the reducing agent in this process? a. increases by 1 b. increases by 2 7. Which of the following is not a redox reaction? a. Cu + Br2→ CuBr2 c. CH4 +H₂O → CO2 + 2H₂O a. CIO +H₂O+e→Cl2 +20H c. 2C10 +2H2O+2e →Cl2 +40H 8. Which of the following half-reactions are balanced? C. CO2 + 6. Consider the following reaction: 2HNO2 + 21 + 2H → 2NO + 12 +2H2O The oxidation number for each nitrogen atom a. reduced as its oxidation number increases c. oxidized as its oxidation number increases 10. Electrons are lost by the A. reducing agent as it undergoes oxidation. C. oxidizing agent as it undergoes oxidation. D) 6H3ASO4 + 4NO D) ASO3 B) CuS + H₂ → H₂S+ Cu D) 2HCl + Na2SO3 → 2NaCl c. decreases by 1 2+ 9. When MnO4 reacts to form Mn the manganese in MnO4 is +6 b. CO+H2O → CO2+H2 D) Pt(OH)₂²+ → PtO3 D. Fe203 d. NaOH + HCl → NaCl + H₂O d. decreases by 2 b. 2C10 +H20+2e →Cl2 +30H™ d. 2C10 +2H20→Cl2 +40H +2e b. reduced as its oxidation number decreases d. oxidized as its oxidation number decreases B. reducing agent as it undergoes reduction. D. oxidizing agent as it undergoes reduction.