Question:
Which one of the following reactions occur at the cathode?
Which one of the following reactions occur at the cathode?
Updated On: Aug 15, 2024
- $ 2O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}O+1/2{{O}_{2}}+2{{e}^{-}} $
- $ Ag\xrightarrow{{}}A{{g}^{+}}+{{e}^{-}} $
- $ F{{e}^{2+}}\xrightarrow{{}}F{{e}^{3+}}+{{e}^{-}} $
- $ C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu $
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The Correct Option is D
Solution and Explanation
At anode, oxidation takes place while at cathode reduction (ie, gain of electron) takes place. Thus, $ C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu $ occurs at cathode.
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Concepts Used:
Nernst Equation
This equation relates the equilibrium cell potential (also called the Nernst potential) to its concentration gradient across a membrane. If there is a concentration gradient for the ion across the membrane, an electric potential will form, and if selective ion channels exist the ion can cross the membrane.
