The standard electrode potentials of Ag⁺/Ag is +0.80V and Cu⁺/Cu is +0.34 V. These electrodes are connected through a salt bridge and if:

• copper electrode acts as a cathode then E° cell is +0.46 V

• silver electrode acts as anode then E^° cell is -0.34 V

• copper electrode acts as anode then E° cell is +0.46 V

• silver electrode acts as a cathode then E° cell is -0.34 V

If three Faradays of electricity is passed through the solutions of AgNO₃, CusO₄ and AuCl₃, the molar ratio of the cations deposited at the cathodes will be :

• 1 : 1 : 1

• 1 : 2 : 3

• 3 : 2 : 1

• 6 : 3 : 2

E${}_{\mathrm{Cu}}^{°}$ - 0.34 V; E${}_{\mathrm{Zn}}^{°}$ = 0.76 V. A Daniel cell contains 0.1 M ZnSO₄ solution and 0.01M CuSO₄ solution at its electrodes. EMF of the cell is:

• 1.10 V

• 1.04 V

• 1.16 V

• 1.07 V

When electric current is passed through an ionic hydride in molten state :

• hydrogen is liberated at anode

• hydrogen is liberated at cathode

• no change takes place

• hydride for migrates towards cathode

What is potential of platinum wire dipped into a solution of 0.1 M in Sn²⁺ and 0.01 M in Sn⁴⁺ ?

• E°

• E° + 0.059

• E° + $\frac{0.059}{2}$

• E° - 0.059

Zn(s) | Zn²⁺(aq)|| Cu²⁺(aq) | Cu(s) is :

(anode)                        (cathode)

• Weston cell

• Daniel cell

• Faraday cell

• Standard cell

447.

Copper sulphate solution does not react with

• Zinc

• Iron

• Silver

• All of these

When 1 F of electricity is passed through acidulated water, O₂ evolved is

• 11.2 dm³

• 5.6 dm³

• 22.4 dm³

• 1.0 dm³

Standard electrode potential of cell H₂ | H⁺||Ag⁺| Ag is

• 0.8 V

• -0.8 V

• -1.2 V

• 1.2 V

The oxidation potential values of A, B, C and D are -0.03 V, +0.108 V, -0.07 V and +0.1 V respectively. The non-spontaneous cell reaction takes place between

• A and B

• Band D

• D and A

• B and C