The emf of the cell Ni | Ni²⁺(1.0 M)| |Au³⁺(1.0M)| Au is[Given E° Ni²⁺/ Ni = – 0.25 V and E° Au³⁺/ Au = +1.5 V]

The volume of oxygen gas liberated at NTP by passing a current of 9650 coulombs through acidified water is :

The same amount of electricity was passed through two cells containing molten Al₂O₃ and molten NaCl. If 1.8 g of Al were liberated in one cell, the amount of Na liberated in other cell is:

In a cell that utilises the reaction Zn(s) + 2H⁺(aq) ⟶ Zn²⁺(aq) + H₂(g) addition of H₂SO₄ to cathode compartment, will

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be (Given F = 96500 C mol^-1; R = 8.314 J K^-1 mol^-1)

On passing electric current of one ampere for 16 min and 5 sec through one litre solution of CuCl₂, all copper of solution was deposited at cathode. The strength of CuCl₂ solution was (molar mass of Cu = 63.5, Faraday constant = 96500 C/mol):

In the silver plating of copper, K[Ag(CN)₂] is used instead of AgNO₃. The reason is

Cu⁺(aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction :
2Cu⁺(aq) ⇌ 2Cu²⁺(aq) + Cu(s)
choose correct Eº forgiven reaction if Eº Cu²⁺/Cu = 0.34 V and Eº Cu²⁺/Cu⁺ = 0.15 V