The efficiency of a fuel cell is given by

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

Standard reduction potentials at 25^oC of Li⁺ / Li, Ba²⁺ / Ba, Na⁺ / Na and Mg²⁺ / Mg are -3.05, -2.90, -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidising agent?

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

The equivalent conductance of Ba²⁺ and Cl^- are 127 and 76 ohm^-1 cm^-1 eq^-1 respectively at infinite dilution. The equivalent conductance of BaCl₂ at infinite dilution will be

For the cell reaction,

Cu²⁺ (C₁, aq) + Zn (s) Zn²⁺ (C₂, aq) + Cu (s) of an electrochemical cell, the change in free energy (ΔG) at a given temperature is a function of

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 Eo for above reaction if

Reduction potential for the following half-cell reactions are

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

Al₂O₃ is reduced by electrolysis at low potentials and high currents. If 4.0 × 10⁴ A of current is passed through molten Al₂O₃ for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, at mass of Al = 27 g mol^-1)