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What is overvolatage or bublle voltage ?...

What is overvolatage or bublle voltage ?

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Some of the electrochemical processes are feasilbe, but are kinetically so slow that at lower voltages, these doe not seem to occur. Hence, in such cases `(e.g., `processes involving liberation of gases `)`, some extra voltage is required than the theoretical value of the standard electrode potential. This extra voltage required is called over voltage or bubble voltage.
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CENGAGE CHEMISTRY-NCERT BASED EXERCISE-Electrolysis, Batteries , and Rusting
  1. What is electrochemical equivalent of a substance ?

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  2. An aqueous solution of CuSO(4) is electrolyszed using Pt electrodes in...

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  3. What are the products of the electrolysis of aqueous solution of KF ?

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  4. Silver is conducting as such while AgNO(3) is conducting in molten sta...

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  5. Why Zn reacts with dilute H(2)SO(4) to give H(2) gas but Cu does not ?

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  6. What is overvolatage or bublle voltage ?

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  7. Which allotrope of carbon is used for making electrodes?

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  8. Which electrolyte is used in dry cell ?

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  9. What would happen if the protective tin coating over an iron bucket i...

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  10. Which metals can be used in the cathodic protection of Fe against rust...

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  11. Name the electrodes used in a fuel cell.

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  12. Name the electrolyte used in fuel cell and mercury cell.

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  13. Rusting of Fe is quicker in saline water than in ordinary water. Why ?

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  14. Why Cr is used for coating Fe ?

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  15. What is the role of ZnCl(2) in dry cell ?

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  16. Why a mercury cell gives a constant voltage throughout its life ?

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  17. Which types of cells are rechargeable ?

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  18. Why a dry cell becomes dead after a long time even if it is not used ?

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  19. Why lead storage can be recharged ?

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  20. Out of Sn and Zn which one protects Fe better even after cracks ?

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