\[ \begin{array}{l} \mathrm{A}^{\prime}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH} ; ' ....

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\[
\begin{array}{l}
\mathrm{A}^{\prime}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{NaOH} ; ' \mathrm{~A}^{\prime} \xrightarrow[400^{\circ} \mathrm{C}]{\mathrm{O}_{2}} \mathrm{~B} \xrightarrow[\text { at } 25^{\circ} \mathrm{C}]{\mathrm{H}_{2} \mathrm{O}} \\
\mathrm{NaOH}+\mathrm{O}_{2}
\end{array}
\]
\( \mathrm{P} \)
\( \mathrm{B} \) is used for oxygenating in submarine. \( \mathrm{A} \) and \( \mathrm{B} \) are:
(1) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) and \( \mathrm{Na}_{2} \mathrm{O} \)
(2) \( \mathrm{Na}_{2} \mathrm{O} \) and \( \mathrm{Na}_{2} \mathrm{O}_{2} \)
(3) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) and \( \mathrm{O}_{2} \)
(4) \( \mathrm{Na}_{2} \mathrm{O} \) and \( \mathrm{O}_{2} \)


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