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Solution


Q.

A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will                      [2024]
1 depend upon type of electrolyte  
2 increase sharply  
3 remain same or cannot be measured accurately  
4 decrease sharply  

Ans.

(3)

Upon dilution, molar conductivity increases because upon dilution, more of the electrolyte is dissociated and more charge carriers are created. Once all of the weak electrolyte is dissociated (at infinite dilution), then molar conductivity (Λmo) does not increase further and becomes constant at a given temperature. (Λmo) cannot be measured accurately for a weak electrolyte; it is calculated by Kohlrausch law.