Electrochemistry questions
1808 published questions with worked solutions.
- **Statement 1:** If an aqueous solution of NaCl is electrolysed using inert electrodes, chlorine gas is produced at the anode,...
- G for the reaction 43 Al + O_2 23 Al_2O_3 is -772 kJ per mol of O_2 . Calculate the minimum EMF (in volts) required to carry out...
- How many faradays are required to reduce 1 mol of BrO_3^- to Br^- in basic medium?
- For the oxidation of ferric oxalate to CO_2 , 18 F of electricity is required. How many moles of ferric oxalate are oxidized?
- During the discharge of a lead storage battery, the density of 40% (by weight) H_2SO_4 fell from 1.225 to 0.98 (which corresponds...
- When electrolysis of KCl is done in alkaline medium, 10 g of KClO_3 is produced via Cl^- +6 OH^- ClO_3^- +3 H_2O +6e^-. A current...
- During the electrolysis of conc. H_2SO_4 , it was found that H_2S_2O_8 and O_2 were liberated in a molar ratio of 3:1. How many...
- Given MnO_4^- +8 H^+ +5e^- Mn^ 2+ +4 H_2O , E^ =1.51 V; Fe^ 3+ +e^- Fe^ 2+ , E^ =0.77 V; Cl_2 +2e^- 2 Cl^- , E^ =1.36 V (and, for...
- What is the total score for the correct statement(s) below? (a) [Score 4] A stronger oxidizing agent has a lower (standard)...
- The unit of electrochemical equivalent is
- The same amount of electricity was passed through two cells containing molten Al_2O_3 and molten NaCl. If 1.8 g of Al were...
- What weight of copper will be deposited by passing 2 faradays of electricity through a solution of a Cu(II) salt?
- The standard cell potential for the cell Zn ,| ,Zn^ 2+ (1 M) ,|| , Cu^ 2+ (1 M) ,| , Cu (E^ for Zn^ 2+ /Zn =-0.76 V; E^ for Cu^...
- Given E^ _ Fe^ 2+ /Fe =-0.441 V and E^ _ Fe^ 3+ /Fe^ 2+ =0.771 V, the standard emf of the reaction Fe +2 Fe^ 3+ 3 Fe^ 2+ will be
- The standard reduction potentials of Zn and Ag in water at 25^ are Zn^ 2+ +2e^- Zn (s), E^ =-0.76 V and Ag^+ +e^- Ag (s), E^...
- Which represents a concentration cell?
- Given Mg^ 2+ +2e^- Mg (s), E^ =-2.37 V, and Cu^ 2+ +2e^- Cu (s), E^ =+0.34 V, the emf of the cell Mg ,| ,Mg^ 2+ ,|| ,Cu^ 2+ ,|...
- Metals can be prevented from rusting by
- Given that E^ _ Fe^ 3+ /Fe =-0.36 V and E^ _ Fe^ 2+ /Fe =-0.439 V, the value of E^ _ Fe^ 3+ ,Fe^ 2+ |Pt would be
- The electrolytic bath used in gold plating of copper articles contains
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