In an voltaic cell the electrode that produces electrons is called the and the c
ID: 1067632 • Letter: I
Question
In an voltaic cell the electrode that produces electrons is called the and the chemical change that occurs at this electrode is called anode, oxidation anode, reduction cathode, oxidation cathode, reduction cannot tell unless we know the species being oxidized and reduced. Which of the following statements is FALSE? Oxidation and reduction half-reactions occur at electrodes in electrochemical cells. All voltaic cells involve the use of electricity to initiate nonspontaneous chemical reactions. Reduction occurs at the cathode. Oxidation occurs at the anode. All electrochemical reactions involve the transfer of electrons. Which of the following Is the best anode? Ag+(epsilon_0 = +0.8V) Au+(epsilon_0 = +1.5V) Li+ (epsilon_0 = -3V) Zn^2+(epsilon_0 = -0.8V) Cu^2+(epsilon_0 = +0.3V)Which of the following is the best cathode+ (epsilon = -3 V)Zn^2 +(epsilon_0 = -0.8V) Ag+(epsilon_0 = +0.8V) Au+(epsilon_0 = +1.5V)Cu^2+(epsilon_0 = +0.3V) Consider the standard voltaic cell: Fe/Fe^2 (epsilon_0 =0.5V) versus Au/Au^3+(epsilon_0 = 1.5V). Which answer identifies the cathode and gives the epsilon_0. for the cell? Fe, -0.5 V Fe, 2 V Fe, 1.06 V Au, 1 V Au, 2 VExplanation / Answer
11) it is well known that cathode is an electrode, where reduction process is taken place and Reduction process is the process of acceptance of electrons. Therefore, cathode electrode has to produces electrons. also electrons flow from anode to cathode.
hence, option D) cathode, reduction is the right answer.
12) a voltaic cell is an electrochemical cell that produce an electric current from a chemical reaction. And a chemical reaction is the combination of redox process (electron transfer is must for a redox reaction). Both half oxidation reactions (at anode) and reduction reaction (at cathode) are occured at both electrodes.
Hence, option B) is the false statement.
it is well known that better reducing agent has more negative value of cell potential and better oxidising agent has more positive value of cell potential. oxidation reaction is taken place at anode and reduction reaction is taken place at cathode. Hence, cathode electrode has the highest negative value of cell potential and anode electrode has the highest positive value of cell potential.
therefore, option 13) B and 14) A will be right answer.
15. reduction cell potential for Fe2+ / Fe will be = 0.5V and for Au3+/ Au will be = -1.5 V . Therefor, reduction cell potential for is Au3+/ Au more negative. It is well known that more negative reduction potential will be more powerful reducing agent and it will be cathode electrode. Hence, Au will be the cathode and Fe will be anode.
cell potential = cathode potential - anode potential = -2.0 V
so, best option would be Au, -2.0 V
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