jee_main_2026_28_january_evening - Electrochemistry Topics

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QUESTION #73 Molar Conductivity And Kohlrausch Law
For strong electrolyte Lambda_m increases slowly with dilution and can be represented by the equation Lambda_m = Lambda_m^circ - Ac^1/2 Molar conductivity values of the solutions of strong electrolyte AB at 18^circC are given below :
c [mol\ L^-1]0.040.090.160.25
Lambda_m [S\ cm^2 mol^-1]96.195.795.394.9
The value of constant A based on the above data [in\ S\ cm^2 mol^-1/(mol/L)^1/2] unit is ____.
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QUESTION #74 Nernst Equation
A volume of x mL of 5text M NaHCO_3 solution was mixed with 10text mL of 2text M H_2CO_3 solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3text mV, then the value of x = ____ mL (nearest integer). Sn(s) | Sn(OH)_6^2-(0.5text M) | HSnO_2^-(0.05text M) | OH^- || Bi_2O_3(s) | Bi(s) Consider upto one place of decimal for intermediate calculations Given : E_HSnO_2^-|Sn(OH)_6^2-^o = -0.9text V E_Bi_2O_3|Bi^o = -0.44text V pKa_(H_2CO_3) = 6.11 frac2.303RTF = 0.059text V textAntilog(1.29) = 19.5
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