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Earn 100

The pressure of H2 required to make the potential of H2- electrode zero in pure water at 298 K is

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Important Questions on Electrochemistry

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The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is: (charge on electron =1.60×10-19 C )
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In the electrochemical cell :ZnZnSO4(0.01M)CuSO4(1.0M)Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 changed to 0.01M, the emf changes to E2. From the followings, which one is the relationship between E1 and E2? Given, RTF=0.059.

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Consider the change in the oxidation state of bromine corresponding to different emf values as shown in the diagram below:
BrO-4 1.82V BrO-3 1.5VHBrO 1.595VBr2 1.0652VBr-
Then the species undergoing disproportionation is
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Consider the following Eo values:

EFe3+/Fe2+0=+0.77V;ESn2+/Sn0=-0.14V

Under standard conditions, the cell potential for the reaction given below is:

Sn(9)+2Fe(aq)3+2Fe(aq)2++Sn(aq)2+

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The limiting molar conductivities λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm2mol-1 respectively. The value of λ°for NaBr is:
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In a cell that utilises the reaction Zn(s)+2H+(aq)Zn2+(aq)+H2(g). Addition of H2SO4 to cathode compartment will:
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The EM3+/M2+0 value for Cr, Mn, Fe and Co ar0.41,+1.57+0.77 and+1.9V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?
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The highest electrical conductivity among the following aqueous solutions is of: