Question

QUESTION 10 Observed liquid junction potential for 0.1 M HCI 0.1 M KCI is +27 mV, while junction potential for the same concentration of 0.1 M NaCl 0.1 M KCI is -6.4 mV, select the correct statement from the following A. Junction potential is a measurement of how fast e-are transferred through the interface B. the opposite sign of the two junction potentials suggest the opposite flow of ions C. electrons transfer faster for the 0.1 M HCI 10.1 M KCl cell D. H+ has higher mobility than K+ and Na+ E. B&D

Answer 1

The junction potential results from a difference in mobility of the electrolyte ions. H+ is very small compared to K+ and Na+ and much more mobile resulting in a large junction potential. K+ and Na+ on the other hand have very similar sizes and mobilities hence the resulting
junction potential is very small.

Hence, correct option is : (E)

But if somehoe (E) is not correct answer , then (D) is definitely correct answer.