The standard electrode potentials of Ag+/Ag is +0.80V and Cu+/Cu

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 Multiple Choice QuestionsMultiple Choice Questions

101.

One Faraday of electricity is passed through molten Al2O3 , aqueous solution of CuSO4 and molten NaCl taken in three different electrolytic cells connected in series. The mole ratio of Al, Cu and Na deposited at the respective cathode is

  • 2: 3: 6

  • 2: 3: 6

  • 6 : 3 : 2

  • 1 : 2: 3


102.

An alloy of Pb-Ag weighing 1.08 g was dissolved in dilute HNO3 and the volume made to 100 mL. A silver electrode was dipped in the solution and the emf of the cell set up Pt(s), H2 (g)| H+ (1M) || Ag+ (aq) | Ag(s) was 0.62V. If E°cell = 0. 80V. What is the percentage of Ag in the alloy? [At 25°C, RT / F = 0.06]

  • 50

  • 25

  • 2.50

  • 10


103.

The standard oxidation potentials of Zn, Cu, Ag and Ni electrodes are +0.76, 0.34, -0.80 and +0.25 V respectively. Which of the following reaction will provide maximum voltage?

  • Cu + 2Ag+(aq) → Cu2+(aq) + 2Ag

  • Zn + 2Ag+(aq) → Zn2+(aq) + 2Ag

  • H2 + Ni2+(aq) → 2H+(aq) + Ni

  • Zn + Cu2+(aq) → Zn2+(aq) + Cu


104.

Both Co3+ and Pt4+ have a coordination number of six. Which of the following pairs of complexes will show approximately the same electrical conductance for their 0.001M aqueous solutions?

  • CoCl· 4NH3 and PtCl. 4NH3

  • CoCl3 · 3NH3 and PtCl4 · 5NH3

  • CoCl3 · 6NH3 and PtCl4  · 5NH3

  • CoCl3 . 6NH3 and PtCl4 . 3NH3


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105.

An alloy of Pb-Ag weighing 1.08g was dissolved in dilute HNO3 and the volume made to 100 mL. A silver electrode was dipped in the solution and the emf of the cell set up Pt(s), H2(g)|H+(1M) || Ag+(aq)|Ag(s) was 0.62V. If E°cell= 0. 80V what is the percentage of Ag in the alloy? [At 25°C, RT IF= 0.06].

  • 50

  • 1

  • 10

  • 25


106.

The standard oxidation potentials of Zn, Cu, Ag and Ni electrodes are +0.76, 0.34, - 0.80 and +0.25 V respectively. Which of the following reaction will provide maximum voltage?

  • Cu + 2Ag+(aq) → Cu+2 (aq) +2Ag

  • Zn + 2Ag+(aq) → Zn2+(aq) + 2Ag

  • H2 + Ni2+ (aq) → 2H+(aq) + Ni

  • Zn + Cu2+(aq) → Zn2+(aq) + Cu


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107.

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


C.

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

E°cell = E°cathod - E°anode

        = E°Ag+/Ag - E°Cu+/Cu

         = - 0.80- 0.34
        = + 0.46 


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108.

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


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109.

ECu° - 0.34 V; EZn° = 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


110.

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


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