JEE Questions for Chemistry Electrochemistry Quiz 11 - MCQExams.com

If the oxidation potential be defined with reference to Ag/ Ag+ half cell ( for which oxidation potential is taken to be zero), which of the following will give the correct value of oxidation potential of 2 Cu/Cu+ half cell (Given that Cu/Cu2+ = ‒ 0.34 V and Ag/Ag+ = ‒ 0.80 V)
  • ‒ 0.46 volts
  • ‒ 1.14 volts
  • 1.14 volts
  • 0.46 volts
The standard reduction potential for Cu2+/Cu is + 0.34V. The reduction potential at pH = 14 for the above couple is {[Cu2+] at pH 14 is 10-19}
  • ‒ 0.22 V
  • + 0.22V
  • ‒ 0.34 V
  • + 0.34V

Chemistry-Electrochemistry-3452.png
  • OA
  • OB
  • OC
  • OD
The reduction potential of hydrogen half- cell will be negative if
  • p (H= 1 atm and [H+ ]= 1 M
  • p (H= 1 atm and [H+]= 2 M
  • p (H2 atm and [H+] = 1 M
  • p(H= 2 atm and [H+] = 2 M
The equivalent conductance at infinite dilution of the salt MX is 160.84 ohm-1 cm2 eq-1. If the transport number of M+ is 0.40, the ionic mobility of X− in cm2s-1 V− is
  • 3.9 × 10-5
  • 6.7 × 10-4
  • 2.5 × 10-3
  • 1.0 × 10-3

Chemistry-Electrochemistry-3456.png

  • Chemistry-Electrochemistry-3457.png
  • 2)
    Chemistry-Electrochemistry-3458.png

  • Chemistry-Electrochemistry-3459.png

  • Chemistry-Electrochemistry-3460.png

Chemistry-Electrochemistry-3462.png
  • Ag, Hg, Cu, Mg
  • Mg, Cu, Hg, Ag
  • Ag, Hg, Cu
  • Cu, Hg, Ag
Standard potentials (Eo) for some half –reactions are given below:
Sn4+ + 2e → Sn2+ ; Eo = +0.15V
2Hg2+ + 2e →Hg2+2 ; Eo = 0.92 V
PbO2 + 4H+ + 2e → Pb2+ + 2H2O ; Eo = +1.45 V
Based on the above, which one of the following statements is correct ?
  • Sn4+ is a stronger oxidizing agent than Pb4+
  • Sn2+ is a stronger reducing agent than Hg2+2
  • Pb2+ is a stronger oxidising agent than pb4+
  • Pb2+ is a stronger reducing agent than Sn2+
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
  • Zn acts as oxidising agent when reacts with HNO3
  • HNO3 is weaker acid than H2SO4 and HCl
  • In electrochemical series Zn is above hydrogen
  • NO-3 is reduced in preference to hydronium ion
Consider the following statements pertaining to fuel cells:
1. Hydrogen-Oxygen fuel cell makes use of conc KOH solution as electrolyte and porous graphite impregnated with platinum as electrodes .
2. The efficiency of the fuel cell is less than unity due to plarisation at electrodes and the resistance offered by the electrode and the electrolyte.
3. The electrical work, assuming the cell to be working reversibly may be represented as −∆G = Welec = −∆H + T∆S
Which of the above statements are correct ?
  • 1 and 2
  • 1 and 3
  • 2 and 3
  • 1, 2 and 3
0:0:1


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