NaCl aqueous solution on electrolysis gives ${\mathrm{H}}_2\left(\mathrm{g}\right),{\mathrm{Cl}}_2\left(\mathrm{g}\right)\text{ and }\mathrm{NaOH}.$
$2{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)+2{\mathrm{H}}_2\mathrm{O}⟶2{\mathrm{OH}}^{-}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)$. In 20 L of NaCl solution (20% by weight), current of 25. A with 62% of current efficiency is passed. Which of the following reaction will occur at anode?

• A

  $2{\mathrm{Cl}}^{-}\to {\mathrm{Cl}}_2+2{\mathrm{e}}^{-}$

• B

  $2{\mathrm{H}}_2\mathrm{O}+2{\mathrm{e}}^{-}\to {\mathrm{H}}_2+2\mathrm{OH}$

• C

  Both (a) and (b)

• D

  None of these