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In a galvanic cell, which reaction could be found at the cathode? A. NO --> HNO2...

In a galvanic cell, which reaction could be found at the cathode?

A. NO --> HNO2

B. NO ---> NO3-

C. None of the above could take place at the cathode

D. Br2   ---> BrO3-

E. MnO2 ---> MnO4-

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