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SCH 4U Name _____________________ Some old test questions!!! Short Answer - 2 marks each or as indicated - 20 MARKS1. What is the oxidation number of iodine in 2. In the reaction: ? identify the reducing agent and the reactant that is reduced. 3. State whether the change of ion to ion is an oxidation or a reduction. 4. Assign oxidation numbers to each of the atoms in ethanoic acid 5. What is the oxidation number of Cl in ? 6. Will a reaction take place if a strip of zinc metal is placed in a solution of lead (II) sulfate? Justify your answer. 7. Calculate (Ecell) for the following equation: (3 marks) Decide whether the equation represents a spontaneous or a nonspontaneous reaction at standard conditions. 8. Define corrosion. Include the equation for the reaction. 3 marks Problem - 4 marks each - 16 total 9. When sodium sulfite solution is added to acidified potassium permanganate solution, the purple permanganate solution turns colourless. : Balance the equation of the overall redox reaction (in acidic medium). 10. Balance the following redox reaction which takes place in a basic solution 11. A bossy student tells you that you should never store a 1 mol/L HNO3 solution in a lead container. Is he correct? Explain your answer (4 marks) 12. Draw an electrochemical cell for the following system: C/Ag+ // Mg2+/Mg In your answer, clearly label: cathode, anode, direction of electron flow, and write the overall equation with Ecell. SCH 4U Name _____________________