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Electrochemistr...

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  • Question 1
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    The E °in the given diagram is,

  • Question 2
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    What is cell entropy change of the following cell?

    Pt(s) | H2 (g) | CH3 COOH, HCl || KCl (aq) |Hg2 Cl2 | (s) | Hg

    P = 1 atm        0.1M               0.1M

    Emf of the cell is found to be 0.045 V at 298 K and temperature coefficient is  

    3.4 x10–4  VK–1

    Given Ka (CH3COOH) = 10–5 M

  • Question 3
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    Following cell has EMF 0.7995 V.

    Pt | H2 (1 atm) | HNO3 (1M) || AgNO3 (1M) | Ag

    If we add enough KCl to the Ag cell so that the final Cl- is 1M. Now the measured emf of the cell is 0.222 V.

    The Ksp of AgCl would be :

  • Question 4
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    The solubility of [Co(NH3 )4 Cl2 ] CIO4 _________ if the  = 50,  = 70, and the measured resistance was 33.5 Ω in a cell with cell constant of 0.20 is ____.

  • Question 5
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    We have taken a saturated solution of AgBr.Ksp  of AgBr is 12 x 10 –14  . If 10  –7  mole of AgNO3  are added to 1 litre of this solution then the conductivity of this solution in terms of  10  –7  Sm  –1  units will be

    [given    Sm2  mol-1   Sm2   mol-1 , 5 x 10-3   Sm2 mol-1 ]

  • Question 6
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    At 298K the standard free energy of formation of H2 O(L) is –237.20kJ/mole while that of its ionisation into H+ ion and hydroxyl ions is 80 kJ/mole, then the emf of the following cell at 298 K will be

     H2 (g,1 bar) | H+ (1M) || OH– (1M) | O2 (g, 1bar)

  • Question 7
    1 / -0.25

    Which of the following cell can produce more electric work.

  • Question 8
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    A hydrogen electrodes is immersed in a solution with pH = 0 (HCl). By how much will the potential (reduction) change if an equivalent amount of NaOH is added to the solution. (Take PH2 = 1 atm) T = 298 K.

  • Question 9
    1 / -0.25

    At what  does the following cell have its reaction at equilibrium?

     Ag(s) | Ag2 CO3 (s) | Na2 CO3 (aq) || KBr(aq) | AgBr(s) | Ag(s)

     KSP = 8 x  10 –12 for  Ag2 CO3 and KSP = 4 x  10 –13 for AgBr

  • Question 10
    1 / -0.25

    Calculate the EMF of the cell at 298 K

    Pt|H2 (1atm)|NaOH(xM),NaCl(xM)|AgCl(s)|Ag

    If E °cl-/AgCl/Ag  = + 0.222 V

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