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ICSE Class 10 Answered

explain how the ions in the water are getting discharged when they are passing  through the cathode electrode.explain it briefly.
Asked by ipranjal01 | 08 Apr, 2018, 12:40: PM
answered-by-expert Expert Answer

At Cathode (Negative electrode)

Positively charged ions (cations) get attracted to the cathode and gain electrons from it to form neutral atom. i.e, H atom.

H+ + e̶  → H

H + H → H2 (Hydrogen molecule)

At Anode (Positive electrode)

Negatively charged ions (anions) get attracted to the anode and lose electrons from it to form neutral atom. i.e, Cl atom

Reaction at anode:

OH- ̶  e ̶→OH × 4

 

OH-  ion discharge in preference to SO42-

 

4OH → 2H2O + O2 (Oxygen molecule)

Answered by Varsha | 08 Apr, 2018, 03:40: PM

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