Which statement about a cathode in a voltaic cell is not correct? a. Oxidation o

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Which statement about a cathode in a voltaic cell is not correct? a. Oxidation occurs at the cathode. b. Reduction occurs at the cathode. c. Usually the cathode is a metal strip. d. In the external circuit, electrons flow toward the cathode. e. Chemical species can have their oxidation number decreased at the cathode. The spontaneous redox reaction in voltaic cell has a. a negative value of E_cell and a negative value of Delta G. b. a positive value of E_cell and a positive value of Delta G. c. a negative value of E_cell and a negative value of Delta G. d. a positive value of E_cell and a positive value of Delta G. e. a positive value of E_cell and a positive value of Delta G. This is a true story; can you explain what happened? Prior to a really important dinner party the bossiness discovered that her silverware was very tarnished. She needed a quick fix. She remembered reading that the (Ag_2S) would be removed if you immersed the silverware in a hot solution of baking soda (NaHCO_3) in part lined with aluminum statements cannot represent what might have been happening? a. AI rightarrow AI^3+ + 3e^- b. Ag^+ + e^- rightarrow Ag c. 2HCO_3^- + S^2- rightarrow CO_3^2- d. HCO_3^- + S^2- rightarrow CO_3^2+ e. 2HCO_3^- + Ag_2S rightarrow H_2S + 2CO_3^2+ + 2Ag The Nernst equation can be used to calculate a. standard cell potentials from standard reduction potentials. b. the change in standard Gibbs free energy from standard cell potentials. c. cell potentials from standard cell potentials when conditions of concentration and temperature are not standard. d. cell potentials given the temperature and reactant concentrations. e. cell potentials from standard oxidation potentials. An electrochemical cell is constructed with a zine metal anode in contact with a 0.052 M solution of silver cathode in contact with a 0.0042 M solution of silver(i) nitrate. What is the emf of this cell at 5 degree C? a. 1.656 V b. 1.465 V c. 1.561 V d. 1.370 V e. 1.609 V

Explanation / Answer

17- Cathode is point centre where reduction takes place. e.g. electrolysis of acidulated water.

Therefor option a is incorrect.

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