During electrolysis of a concentrated aqueous solution of NaCl , what is the product at anode ?
During electrolysis of a concentrated aqueous solution of NaCl , what is the product at anode ?
A. `Na`
B. `Cl_(2)`
C. `O_(2)`
D. `H_(2)`.
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Correct Answer - B
`Cl_(2)` is produced as `Cl^(-)` ions need voltage for oxidation to `Cl_(2)` than needed by `H_(2)O` for oxidation to `O_(2)` (This extra voltage needed by `H_(2)O` is called overvoltage) .
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