midterm2a_sp06 - 1[7 points Which substance is the reducing...

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1. [7 points] Which substance is the reducing agent in the following reaction? Fe 2 S 3 + 12HNO 3 2Fe(NO 3 ) 3 + 3S + 6NO 2 + 6H 2 O a. HNO 3 b. S c. NO 2 d. Fe 2 S 3 e. H 2 O 2. [7 points] What is the oxidation number of manganese in potassium permanganate, KMnO 4 ? 3. [7 points] What is the coefficient of Fe 3+ , when the following redox equation is balanced in basic solution ? CN - + Fe 3+ CNO - + Fe 2+ 4. [7 points] What are the coefficients of H 2 S and H 2 O, when the following redox equation is balanced in acidic solution ? MnO 4 - + H 2 S S + Mn 2+ + H 2 O 5. [7 points] In a voltaic cell, electrons flow from ________________ . a. The salt bridge to the anode b. The anode to the salt bridge c. The cathode to the anode
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d. The salt bridge to the cathode e. The anode to the cathode 6. [7 points] Which one of the following substances would you expect to be the best oxidizing agent? 7. [7 points] Which of the following reactions will occur spontaneously as written (standard reduction potentials are given on the back page)?
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