(i) The specific conductance of 2-5 x 10^-4 M formic acid is 5.25 x 10^-5 ohm^-1 cm^-1. Calculate its molar conductivity and degree of dissociation. Given λ° _(H⁺)=349.5 ohm^-1 cm² mol^-1 and λ° _(HCOO^-)= 50.5 ohm^-1 cm² mol^-1


(ii) Calculate the time taken to deposit 1.27g of copper at cathode when a current of 2 amp. is passed through the solution of CuSO₄ (Atomic weight of Cu=63.5 gmol^-1)

OR

(i) The resistance of a conductivity cell with 0.1M KCl solution is 200 ohm. When the same cell is filled with 0.02M NaCl solution, the resistance is 1100 ohm. If the conductivity of 0.1M KCl solution is 0.0129 ohm^-1cm^-1, calculate the cell constant and molar conductivity of 0.02M NaCl solution.

(ii) The emf (E°_cell) of the following reaction is 0.89V:



Calculate the value of ▵G° for the reaction. Predict whether the above reaction will be spontaneous or not.

Solution

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