In electrolysis of aqueous $NaOH$ at $NTP$,$2.8 \ L$ of oxygen gas is liberated at the anode. The amount of gas liberated at the cathode will be ............ $L$.

  • A
    $2.8$
  • B
    $5.6$
  • C
    $1.4$
  • D
    $11.2$

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