19. What mass of platinum could be plated on an electrode from the electrolysis of a...

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19. What mass of platinum could be plated on an electrode from the electrolysis of a Pt(NO3)2 solution with a current of 0.500 A for 55.0 s? a) 27.8 mg b) 45.5 mg c) 53.6 mg d) 91.0 mg e) 97.3 mg 20. In which case would the least number of faradays of electricity be required for the liberation of 1.0 g of free metal? a) K from molten KOH b) Na from molten NaCl c) Cu from aqueous CuSO4 d) Ag from aqueous AgNO3 e) Cr from aqueous Cr(NO3)3 21. Fluoride ions in aqueous solution are difficult to oxidize at the anode of an electrolytic cell because a) aqueous solutions of fluorides are nonconducting b) it is impossible to find the proper material from which to build the electrodes c) fluorides are not very soluble d) oxygen is released from water in preference to fluorine e) hydrogen is released from water in preference to fluorine 22. Which of these ions is the best reducing agent? a) Cl- b) Fe²+ c) Sn²+ d) Cr2+ e) Cs+ 23. Which of these ions is the best oxidizing agent? a) Ag+ b) Cu²+ c) Cd²+ d) Hg2+ e) Zn²+ 24. Which of the following is true for the Zn/Cr galvanic cell? a) The electrons flow from the cathode to anode b) The electrons flow from zinc to chromium c) The electrons flow from the chromium to the zinc d) Chromium is oxidized e) Zinc is reduced 19. What mass of platinum could be plated on an electrode from the electrolysis of a Pt(NO3)2 solution with a current of 0.500 A for 55.0 s? a) 27.8 mg b) 45.5 mg c) 53.6 mg d) 91.0 mg e) 97.3 mg 20. In which case would the least number of faradays of electricity be required for the liberation of 1.0 g of free metal? a) K from molten KOH b) Na from molten NaCl c) Cu from aqueous CuSO4 d) Ag from aqueous AgNO3 e) Cr from aqueous Cr(NO3)3 21. Fluoride ions in aqueous solution are difficult to oxidize at the anode of an electrolytic cell because a) aqueous solutions of fluorides are nonconducting b) it is impossible to find the proper material from which to build the electrodes c) fluorides are not very soluble d) oxygen is released from water in preference to fluorine e) hydrogen is released from water in preference to fluorine 22. Which of these ions is the best reducing agent? a) Cl- b) Fe²+ c) Sn²+ d) Cr2+ e) Cs+ 23. Which of these ions is the best oxidizing agent? a) Ag+ b) Cu²+ c) Cd²+ d) Hg2+ e) Zn²+ 24. Which of the following is true for the Zn/Cr galvanic cell? a) The electrons flow from the cathode to anode b) The electrons flow from zinc to chromium c) The electrons flow from the chromium to the zinc d) Chromium is oxidized e) Zinc is reduced

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19 The correct answer is c 536 mg In electrolysis the amount of substance that is plated on an electrode is determined by the amount of electric charg... View the full answer