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Solution - Electrolytic Cells and Electrolysis - Introduction

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Question

Consider the reaction: Cr2O72--+ 14H+ + 6e- -> 2Cr3+ + 7H2O What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr2O72- ?

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The charge of how many coulomb is required to deposit 1.0 g of sodium metal (molar mass 23.0 g mol-1) from sodium ions is -

  1. 2098
  2. 96500
  3. 193000
  4. 4196
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Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution:

Na+(aq) + e ⟶ Na (s) E0 =  2.71 V

H+(aq) + e ⟶ `1/2`  H2 (g) E0 = 0.00 V

On the basis of their standard reduction electrode potential (E0) values, which reaction is feasible at the cathode and why?

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Three electrolytic cells A,B,C containing solutions of ZnSO4, AgNO3 and CuSO4, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?

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State the first and second law of electrolysis

 

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Number of faradays of electricity required to liberate 12 g of hydrogen is:

(a) 1

(b) 8

(c) 12

(d) 16

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