CHEM 1331 EXAM 1 FALL 2000 1. Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient for the hydrogen sulfite ion, HSO 3-. MnO 4-(aq) + HSO 3-(aq) → Mn 2+ (aq) + SO 4 2-(aq) (A) 5 (B) 1 (C) 2 (D) 10 (E) 6 2. How many milliliters of 1.58 M HCl are needed to react completely with 46.4 g NaHCO 3 [molar mass = 84.02 g/mol] (A) 1144 mL (B) 1072 mL (C) 1276 mL (D) 46.4 mL (E) 350 mL 3. Choose the correct category for the reaction below and state whether it is a redox reaction or not. Ca(s) + 2 H 2 O(l) → Ca(OH) 2 (aq) + H 2 (g) (A) combination reaction but not a redox reaction (B) combination reaction and a redox reaction (C) decomposition reaction and a redox reaction (D) displacement reaction and a redox reaction (E) displacement reaction but not a redox reaction 4. The symbol and atomic number of the halogen in period 4 are: (A) Se, 78.96 (B) Se, 34 (C) Br, 35 (D) I, 53 (E) Sb, 51 5. Identify the reducing reagent in the following redox reaction, Hg 2+ (aq) + Cu(s) → Cu 2+ (aq) + Hg(l) (A) Cu 2+ (aq) (B) Cu(s) (C) Hg(l) (D) Hg 2+ (aq) (E) not a redox equation 6. Which of the following is/are false? i)
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