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Q.

Which of the following reaction is possible at anode ?

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a

H2 → 2H–

b

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c

F2 → 2F–

d

2Cr3++7H2​O→Cr2​O72−​+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++7H2​O→Cr2​O72−​+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++7H2​O→Cr2​O72−​+14H+
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