$A + H_2O \to NaOH$; $A$ $\xrightarrow[400 \ ^oC]{O_2} B$ $\xrightarrow[25 \ ^oC]{H_2O} NaOH + O_2$
$B$ is used for oxygenating in submarines. $A$ and $B$ are:

  • A
    $Na_2O_2$ and $Na_2O$
  • B
    $Na_2O$ and $Na_2O_2$
  • C
    $Na_2O_2$ and $O_2$
  • D
    $Na_2O$ and $O_2$

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