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Question
Assertion :Current stops flowing when Ecell=0. Reason: Equilibrium of the cell reaction is attained.
Assertion :Current stops flowing when Ecell=0. Reason: Equilibrium of the cell reaction is attained.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
At each electrode-electrolyte interface there is a tendency of metal ions from the solution to deposit on the metal electrode trying to make it positively charged. At the same time, metal atoms of the electrode have a tendency to go into the solution as ions and leave behind the electrons at the electrode trying to make it negatively charged. At equilibrium, there is a separation of charges and depending on the tendencies of the two opposing reactions, the electrode may be positively or negatively charged with respect to the solution. A potential difference develops between the electrode and the electrolyte which is called electrode potential.Hence, at equillibrium there is no opposition of charges at any of the electrode and it implies E0cell=0
At each electrode-electrolyte interface there is a tendency of metal ions from the solution to deposit on the metal electrode trying to make it positively charged. At the same time, metal atoms of the electrode have a tendency to go into the solution as ions and leave behind the electrons at the electrode trying to make it negatively charged. At equilibrium, there is a separation of charges and depending on the tendencies of the two opposing reactions, the electrode may be positively or negatively charged with respect to the solution. A potential difference develops between the electrode and the electrolyte which is called electrode potential.
Hence, at equillibrium there is no opposition of charges at any of the electrode and it implies E0cell=0
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