Electrochemistry

For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25oC. The value of standard Gibb's energy, \(\Delta\)Go will be
(F = 96500 C mol\(-\)1)

Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al2(SO4)3. Given that \(\mathop \Lambda \limits^ \circ\)Al3+ and \(\mathop \Lambda \limits^ \circ\)so\(_4^{2 - }\) are the equiv...

Consider the following relations for emf of an electrochemical cell
(i)   EMF of cell = (Oxidation potential of anode) \(-\) (Reduction potential of cathode)
(ii)  EMF of cell = (Oxidation potential of anode) + (Reduction potential of catho...

The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is

Given :
(i)   Cu2+ + 2e\(-\) \(\to\) Cu,  Eo = 0.337 V
(ii)  Cu2+ + e\(-\) \(\to\) Cu+,  Eo = 0.153 V
Electrode potential, Eo for the reaction,
Cu+ + e\(-\) \(\to\) Cu,  will be

Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 \(\times\) 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is product? (Assume 100% current efficiency, at mass of Al ...

Standard free energies of formation (in kJ/mol) at 298 K are \(-\)237.2, \(-\) 394.4 and \(-\)8.2 for H2O(l), CO2(g) and pentane (g) respectively. The value of Eocell for the pentane-oxygen fuel cell is

On the basis of the following Eo values, the strongest oxidizing agent is
[Fe(CN)6]4\(-\) \(\to\) [Fe(CN)6]3\(-\) + e\(-\);  Eo = \(-\)0.35 V
Fe2+ \(\to\) Fe3+ + e\(-\);  Eo = \(-\)0.77 V

Kohlrausch's law states that at

The efficiency of a fuel cell is given by

The equilibrium constant of the reaction:
Cu(s) + 2Ag+(aq) \(\to\) Cu2+(aq) + 2Ag(s);
Eo = 0.46 V at 298 K is

EoFe2+/Fe = \(-\) 0.441 V and EoFe3+/Fe2+ = 0.771 V, the standard EMF of the reaction Fe + 2Fe3+ \(\to\) 3Fe2+ will be

A hypothetical electrochemical cell is shown below.
\(A\left| {{A^ + }\left( {xM} \right)} \right|\left| {{B^ + }\left( {yM} \right)} \right|B\)
The emf measured is + 0.20 V. The cell reaction is

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is
(Atomic mass : Al = 27)

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H ions in solution by the same quantity of electric charge will be

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibrium constant of the reaction would be

On the basis of the information available from the reaction,
4/3Al + O2 \(\to\) 2/3Al2O3,   \(\Delta\)G = \(-\) 827 kJ mol\(-\)1 of O2,
the minimum e.m.f. required to carry out an electrolysis of Al2O3 is
(F = 96500 C mol\(-\)1)

The e.m.f. of a Daniell cell at 298 K is E1.

When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?

In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam

Standard electrode potentials are Fe2+/Fe [Eo = \(-\)0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are kept together, then

For the disproportionation of copper
2Cu+  \(\to\) Cu2+ + Cu, Eo is
(Given Eo for Cu2+/Cu is 0.34 V and
Eo for Cu2+/Cu+ is 0.15 V.)

Cell reaction is spontaneous when

Equivalent conductances of Ba2+ and Cl\(-\) ions are 127 and 76 ohm\(-\)1 cm\(-\)1 eq\(-\)1 respectively. Equivalent conductance of BaCl2 at infinite dilution is