\[ \mathrm{A}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{NaOH} ; \mathrm{A} \underset{400...
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0\[
\mathrm{A}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{NaOH} ; \mathrm{A} \underset{400^{\circ} \mathrm{C}}{\stackrel{\mathrm{O}_{2}}{\longrightarrow}} \mathrm{B} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow} \mathrm{NaOH}
\]
\( \mathrm{B} \) is used for purification of air in submarines. \( \mathrm{A} \) and \( \mathrm{B} \) are
(a) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) and \( \mathrm{Na}_{2} \mathrm{O} \)
(b) \( \mathrm{Na}_{2} \mathrm{O} \) and \( \mathrm{Na}_{2} \mathrm{O}_{2} \)
(c) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) and \( \mathrm{O}_{2} \)
(d) \( \mathrm{Na}_{2} \mathrm{O} \) and \( \mathrm{O}_{2} \)
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