PYQSidePowered by
ExamsMy practice
The potential for the given half cell at 298 K is (-) 10-2 V 2H+(aq) + 2e- H2(g) [H+] = 1 M, PH2 = 2 atm (Given : 2.303 RT/F = 0.06 V, 2 = 0.3)
1
Nernst equation (n = 2), E H+/H2 = 0:
E = E - 0.062 PH2[H+]2
⇒ E = 0 - 0.03 212
⇒ E = -0.03 0.3 = -0.009 V
∴ E = -0.9 10-2 V ≈ -1 10-2 V (nearest integer)
Answer: 1
The amount of electricity in Coulomb required for the oxidation of 1 mol of H2O to O2 is 105 C.
Consider the following redox reaction : MnO4- + H+ + H2C2O4 Mn2+ + H2O + CO2 The standard reduction potentials are given as below ( E0red ) : E MnO4-/Mn2+ = +1.51 V E CO2/H2C2O4 = -0.49 V If the equilibrium constant of the above reaction is given as Keq = 10x, then the value of x = (nearest integer)
Identify the factor from the following that does not affect electrolytic conductance of a solution.
One Faraday of electricity liberates x 10-1 gram atom of copper from copper sulphate. x is .
The values of conductivity of some materials at 298.15 K in S m-1 are 2.1 103, 1.0 10-16, 1.2 10, 3.91, 1.5 10-2, 1 10-7, 1.0 103. The number of conductors among the materials is .
Reduction potential of ions are given below: [figure] The correct order of their oxidising power is :
The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0.015 A for 15 minutes is 10-4 g. (Atomic mass of zinc = 65.4 amu)
A constant current was passed through a solution of AuCl4- ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was 1.314 g. The total charge passed through the solution is 10-2 F. (Given atomic mass of Au = 197)
The mass of silver (Molar mass of Ag : 108 g mol-1) displaced by a quantity of electricity which displaces 5600 mL of O2 at S.T.P. will be g.
Which of the following statements is not correct about rusting of iron?