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Electrochemistry Test - 6
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Electrochemistry Test - 6
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  • Question 1/10
    1 / -0

    Consider the following disproportionation:

    If the initial concentration of perchlorate ion is 0.1 M, then what would be its concentration at equilibrium at 298 K?

    Solutions

     

  • Question 2/10
    1 / -0

    A silver electrode is immersed in a 1.00M solution of AgNO3. This half-cell is connected to a hydrogen half-cell in which the hydrogen pressure is 1.00 atm and the H+ concentration is unknown. The voltage of the cell is 0.78 V. The pH of the acid solution is

    Solutions

    Pt(s)|H2(g, 1 atm)|H+(x M) || Ag+(1.00M)|Ag(s)
    Ecell = Eocell – (0.0592/n)log Q
    Eocell = Eo(Ag+/Ag) - Eo(H2/H+)Eocell
    = +0.800V – (0) = +0.800V
    Overall: 2Ag+ + H2(g, 1 atm) → 2Ag(s) + 2H+
    n = 2
    Ecell = Eocell – (0.059/n)log [H+]2/[Ag+]2
    0.78V = 0.800V – (0.059/2)log [x]2/[1.00M]2- 0.020
    = –(0.059/2) log [H+]2- 0.020
    = –(0.059/2) 2log [H+] - 0.020
    = –(0.059) log [H+]0.3389
    = log [H+]pH = - log[H+]
    = -0.3389

     

  • Question 3/10
    1 / -0

    Which of the following statements is correct about metallic conduction?

    Solutions

    Metallic conduction decreases with increase in temperature and electrolytic conduction increases with increase in temperature.

     

  • Question 4/10
    1 / -0

    Directions For Questions

    The following question consists of Assertion (A) and Reason (R). Mark the appropriate answer.

    ...view full instructions


    (A): Equivalent conductance of all electrolytes decreases with increasing concentration.
    (R): Lesser ions are available per gram equivalent at higher concentration.

    Solutions

    Equivalent conductance is defined as the conductance of all the ions produced by one gram equivalent of an electrolyte in a given solution. As lesser ions are available per gram equivalent at higher concentration, So, equivalent conductance of all electrolytes decreases with increasing concentration.

     

  • Question 5/10
    1 / -0

    When a lead storage cell is charged,

    Solutions

    During discharge of a lead storage cell, H2SO(sulphuric acid) is consumed, lead is consumed, and PbSO4 (lead sulphate) is formed. During charging, the reverse occurs.
    2PbSO4 (s) + 2H2O → Pb (s) + PbO2 (s) + 2H2SO4 (l)

     

  • Question 6/10
    1 / -0

    Hydrogen-oxygen fuel cells are used in spacecrafts to supply

    Solutions

    A fuel cell is a device that converts the chemical energy from a fuel into electricity through a chemical reaction of positively charged hydrogen ions with oxygen. Hydrogen ions, electrons and oxygen react to form water.

     

  • Question 7/10
    1 / -0

    The reaction that takes place at anode in a dry cell is

    Solutions

     

  • Question 8/10
    1 / -0

    When 'C' amperes of electricity is passed through an electrolytic solution for 't' seconds, 'm' gram metal is deposited on cathode. The equivalent weight 'E' of the metal would be

    Solutions

    When 'C' amperes of electricity is passed through an electrolytic solution for 't' seconds, 'm' gram metal is deposited on cathode.
    The equivalent weight 'E' of the metal would be

     

  • Question 9/10
    1 / -0

    In electroplating, m g of silver is deposited when 4 A of current flows for 2 minutes. The amount (in g) of silver deposited by 6 A of current flowing for 40 seconds will be

    Solutions


     

  • Question 10/10
    1 / -0

    A sample of 1.08 g of pure silver was converted into silver nitrate and its solution was taken in a beaker. It was electrolysed using platinum cathode and silver anode. 0.01 faraday of electric current was passed using 0.15 volt above the decomposition potential of silver. The silver content of the beaker after the above process must be

    Solutions

     

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