Electrochemistry questions
1808 published questions with worked solutions.
- Kohlrausch's law states that at
- Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H _2 O(l) , CO _2 (g) and pentane (g)...
- The sequence of ionic mobility in aqueous solution is
- Given: (i) Cu ^ 2+ + 2e^- Cu , E^ = 0.337 V (ii) Cu ^ 2+ + e^- Cu ^+, E^ = 0.153 V Electrode potential, E^ for the reaction, Cu...
- Al _2 O _3 is reduced by electrolysis at low potentials and high currents. If 4.0 10^4 amperes of current is passed through...
- The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mhos cm^2 and at infinite dilution is 400 mhos cm^2....
- Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al _2( SO _4)_3. Given...
- Consider the following relations for emf of an electrochemical cell : (i) EMF of cell = (Oxidation potential of anode) -...
- An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:
- A solution contains Fe ^ 2+ , Fe ^ 3+ and I ^- ions. This solution was treated with iodine at 35^ C . E^ for Fe ^ 3+ / Fe ^ 2+ is...
- Standard electrode potential of three metals X, Y and Z are -1.2 V , +0.5 V and -3.0 V respectively. The reducing power of these...
- The electrode potentials for Cu ^ 2+ _ (aq) + e^ - Cu ^ + _ (aq) and Cu ^ + _ (aq) + e^ - Cu _ (s) are +0.15 V and +0.50...
- Standard electrode potential for Sn ^ 4+ / Sn ^ 2+ couple is +0.15 V and that for the Cr ^ 3+ / Cr couple is -0.74 V . These two...
- The Gibbs energy for the decomposition of Al _2 O _3 at 500^ C is as follows: 2 3 Al _2 O _3 4 3 Al + O _2; _r G = +960 kJ mol ^...
- Four successive members of the first series of the transition metals are listed below. For which one of them the standard...
- Molar conductivities ( ^0_m ) at infinite dilution of NaCl, HCl and CH _3 COONa are 126.4, 425.9 and 91.0 S cm ^2 mol ^ -1...
- Limiting molar conductivity of NH _4 OH (i.e. ^0_m( NH _4 OH )) is equal to:
- A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the...
- At 25^ molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^ -1 cm^2 mol^ -1 and at infinite...
- A button cell used in watches functions as following Zn(s) + Ag _2 O(s) + H _2 O(l) 2 Ag(s) + Zn ^ 2+ (aq) + 2 OH ^- (aq) If half...
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