8. Fall in concentration around the electrode is directly proportional to the speed of that
ion which
a) move towards the electrode
b) move away from the electrode
c) remain in the solution
d) have greater charge
Answers
Answer:
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Answer:
Migration of ions under influence of electric field:
Cu
On passing electric current through electrolyte solution, ions migrate and discharged
oppositely charged electrodes. The migration of ions can be demonstrated by simple
experiment.
The lower portion of U-tube is filled with 5% agar-agar solution in water with small
quantity of CuCr2O7.
It is allowed to set by cooling as dark green jelly. Some charcoal powder is sprinkled in
both limbs.
Then solution of KNO3 and agar-agar is placed in each limb and allowed to set as jelly.
Finally solution of KNO3 in water is filled in each limb and platinum electrodes are
placed as shown in figure.
When electric current is passed, Cu2+ ions migrate towards cathode (-ve electrode). Due
to this blue colour appears in cathode side and yellow colour in anode side by Cr2O7
2-
ions. From the movement of these colour bands, speed of ions can be compared.