Important Questions of Electrochemistry Chemistry | Zigya

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
51.

The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The potential of the cell would be [use value of 2.303 RTF = 0.59 V]

  • 0.059 V

  • 0.088 V

  • 0.178 V

  • -0.177 V


52.

The equivalent conductivity of a solution containing 2.54 g of CuSO4, per L is 91.0 W-1 cm2eq-1. Its conductivity would be

  • 2.9 × 10-3Ω-1cm-1

  • 1.8 × 10-2 Ω-1 cm-1

  • 2.4 × 10-4 Ω-1cm-1

  • 3.6 × 10-3Ω-1cm-1


53.

MnO4- + 8H- + 5e-  Mn2+ + 4H2O; E° = 1.51VMnO2 + 4H+ + 2e-  Mn2+ + 2H2O; E° = 1.23 V E°MnO4-|MnO2 is

  • 1.70 V

  • 0.91 V

  • 1.37 V

  • 0.548 V


54.

Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al2(SO4)3 ? Given that ΛAl3+° and ΛSO42-° are the equivalent conductances at infinite dilution of the respective ions?

  • 2ΛAl3+° + 3ΛSO42-°

  • ΛAl3+° + ΛSO42-°

  • (ΛAl3+°+ 3ΛSO42-° )× 6

  • 13ΛAl3+°+ 12ΛSO42-°


Advertisement
55.

The equivalent conductances of two ions at infinite dilution in water at 25°C are given below

          ΛBa2+°= 127.00 Scm2/equiv.ΛCl-° = 76.00 Scm2/ equiv.

The equivalent conductance (in Scm2/equiv) of BaCl2 at infinite dilution will be

  • 203

  • 279

  • 205.5

  • 139.5


56.

The EMF of the cell,

Mg | Mg2+(0.01M) || Sn2+(0.1M)| Sn at 298K is (EMg2+/Mg°= -2.34 V, ESn2+/Sn°= -0.14V)

  • 2.17 V

  • 2.23V

  • 2.51 V

  • 2.45 V


57.

The equivalent conductance at infinite dilution of a weak acid such as HF

  • can be determined by extrapolation of measurements on dilute solutions of HCl, HBr and HI

  • can be determined by measurement on very dilute HF solutions

  • can best be determined from measurements on dilute solutions of NaF, NaCl and HCl

  • is an undefined quantity


58.

The number of Faradays needed to reduce 4 g equivalents of Cu2+to Cu metal will be

  • 1

  • 2

  • 1/2

  • 4


Advertisement
59.

Which one of the following cells can convert chemical energy of H2 and O2 directly into electrical energy?

  • Mercury cell

  • Daniell cell

  • Fuel cel

  • Lead storage cell


60.

For the following cell reaction,Ag| Ag+| AgCl| Cl| Cl2, PtGf°(AgCl)= -109 kJ/molGf°(Cl)= -129 kJ/molGf°(Ag+)= 78 kJ/mo/

E° of the cell is

  • - 0.60 V

  • 0.60 V

  • 6.0 V

  • None of these


Advertisement