Answer Happy

A 6. Which of the following indicates reduction? Oxidation number Electrons Oxygen Decrease Lose Removal B. Decrease Lose Addition C. Decrease Gain Removal D. Increase Gain Addition 7. The reaction between iron(III) sulphate solution and sodium iodide solution can be represented by the ionic equation below. 2Fe+(aq) + 21 (aq) + 2Fe?" (aq) + 13(aq) Which of the following shows the correct change in the oxidation number of iodine? A. Oto-2 O to-1 -1 to 0 D. -1 to-2 B. C. A. HPHS4068/ Ex 4/ Ch 7-8/P2 8. In which of the following reactions does the oxidation number of carbon show the greatest increase? A. CH (9) +202(g) → CO2(g) + 2H2O(1) B. C(s) + O2(g) → CO2(g) c. 2CO(g) + O2(g) → 2002(g) D. CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H20(1) 9. In which of the following changes is chlorine reduced? HCI to CIO B.HCl to HCIO C. Cl- to CI D. Cl2 to HCI 10. The equation below represents the reaction of chlorine with sodium hydroxide solution. Cl2(g) + 2NaOH(aq) → NaCl(aq) + NaOCl(aq) + H2O(1) Which of the following statements about this reaction is/are correct? (1) Sodium hydroxide acts as an oxidizing agent. (2) The oxidation number of chlorine changes from 0 to -1. (3) The oxidation number of chlorine changes from 0 to +1. A. (1) and (2) only B. (1) and (3) only (2) and (3) only D. (1), (2) and (3) C.