Without losing its concentration ZnCl₂ solution cannot be kept in contact with

Standard electrode potentials are

Fe²⁺ / Fe, E^o = - 0.44 V

Fe³⁺ / Fe²⁺ , E^o = 0.77 V

Fe²⁺, Fe³⁺ and Fe block are kept together, then

Cu⁺ (aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction

2 Cu⁺ (aq) Cu²⁺ (aq) + Cu (s)

Choose the correct E_o for above reaction if

The specific conductance of a 0.1 N KCl solution at 23^o C is 0.012 ohm^-1 cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

An electrochemical cell is shown below

Pt, H₂ (1 atm) |HCl (0.1 M)| CH₃COOH(0.1 M)| H₂ (1 atm), Pt. the emf of the cell will not be zero, because

Kohlrausch's law states that at

E^o_Fe²⁺/Fe = -0.441 V and E^o_{Fe²⁺/Fe²⁺}= 0.771V, the standard emf of the reaction Fe +2Fe³⁺ →3Fe ²⁺ will be

The efficiency of a fuel cell is given by

A hypothetical electrochemical cell is shown below

A | A⁺ (xM) || B⁺ (yM) | B

The emf measured is + 0.20 V. The cell reaction is

4.5 g of aluminium (at. mass 27 u) 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