Which of the following reaction is possible at anode ?

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H₂ → 2H^–

F₂→ 2F^–

2Cr³⁺+7H₂O→Cr₂O₇²⁻+14H⁺

answer is A.

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Detailed Solution

In a galvanic cell, the anode is the electrode where oxidation (loss of electrons) happens; it is the negative electrode since electrons are left on the electrode when oxidation occurs.
As less oxidation takes place, fewer ions enter the solution, and fewer electrons are left on the electrode, the cathode—the electrode where reduction (electron gain) occurs—becomes the positive electrode in a galvanic cell.
In the reaction 2Cr³⁺+7H₂O→Cr₂O₇²⁻+14H⁺
As the oxidation state changes from +3 to +6 for Cr and is being oxidized, making this reaction feasible at the anode.
Hence the correct option is A)2Cr³⁺+7H₂O→Cr₂O₇²⁻+14H⁺

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