(a) Solutions of two electrolytes 'A' and 'B' are diluted. The limiting molar conductivity of 'B' increases 1.5 times while that of 'A' increases 25 times. Which of the two is a strong electrolyte ? Justify your answer. (b) The products of electrolysis of aqueous NaCl at the respective electrodes are : Cathode : H_(2), Anode : Cl_(2) and not O_(2). Explain.

(a) Solutions of two electrolytes 'A' and 'B' are diluted. The limitin

1.	(a) Solutions of two electrolytes 'A' and 'B' are diluted. The limiting molar conductivity of 'B' increases 1.5 times while that of 'A' increases 25 times. Which of the two is a strong electrolyte ? Justify your answer. (b) The products of electrolysis of aqueous NaCl at the respective electrodes are : Cathode : H_(2), Anode : Cl_(2) and not O_(2). Explain.
Answer» SOLUTION :(a) 'B' is a strong elctrolyte sinece it is already almost completely ionised (`alpha~~1`). DILUTION simply helps in its dissociation i.e., the ions get separated. Therefore, the increase in molar conductivity upon dilution is small. However, 'A' is a weak electrolyte because it is weakly ionised `alpha lt 1)`. Dilution helps in its ionisation as well as dissociation. Therefore, the increase in molar conductivity is quite large. For more details, CONSULT SECTION 19. (b) For explanation, consult section 15.