In a Galvanic cell, the following reaction takes place: 2H2O ⇋ O2+ 4H+ + 4e it occurs at the
Correct answer: B. Anode
- A. Cathode
- B. Anode
- C. External conductor
- D. Cathode and anode
Explanation
In a Galvanic cell, the redox reaction occurs at two different electrodes, the cathode, and the anode. At the cathode, reduction takes place, which involves the gain of electrons. In the given reaction, the reduction-half reaction is:O2 + 4H+ + 4e- → 2H2OAt the anode, oxidation takes place, which involves the loss of electrons. The oxidation-half reaction is:2H2O → O2 + 4H+ + 4e-This is the oxidation reaction (water loses electrons and produces oxygen + protons).Therefore, this reaction occurs at the anode of the Galvanic cell.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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