Practice Problems

Question: Which of these can act as an oxidizing agent? A. I- B. Mg C. Br2 D. S2- Answer: B - Equivalent to both C and D

Question: When an equation for an oxidation-reduction reaction is balanced, A. charge, but not mass, is conserved B. both mass and charge are conserved C. coefficients are adjusted to conserve mass D. coefficients are adjusted to conserve charge Answer: B - Equivalent to both C and D

Question: To balance the half-reaction for the basic solutions: __H2O + __e + __NO3-(aq) __NH3(aq) + __OH-(aq) using the smallest whole number coefficients, the coefficients on NO3- and NH3 respectively are: A. 1 and 1 B. 2 and 2 C. 1 and 2 D. 2 and 1 Answer: A

Question: The electrolysis of a water solution of NaCl is represented best by the equation A. 2 NaCl(l) -> 2 Na(s) + Cl2(g) B. 2 H2O(l) -> 2 H2(g) + O2(g) C. 2 Cl-(aq) -> Cl2(g) + e- D. 2 Cl-(aq) + 2 H2O(l) -> Cl2(g) + H2(g) + 2 OH-(aq) Answer: D - The first equation would represent the electrolysis of molten NaCl.

Question: In the electolysis of an aqueous solution of NaCl, the product at the cathode is A. Na B. Cl2 C. H2 and OH- D. H+ and Cl2 Answer: C - Reduction occurs at the cathode. Note that these are 2 of the 3 products seen in the equation of the last quation.

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