\[ \mathrm{Na} \xrightarrow{\mathrm{H}_{2} \mathrm{O}} \mathrm{A} \xrightarrow{\mathrm{CO}_{2}} ....

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\[
\mathrm{Na} \xrightarrow{\mathrm{H}_{2} \mathrm{O}} \mathrm{A} \xrightarrow{\mathrm{CO}_{2}} \mathrm{~B} \xrightarrow{\mathrm{SO}_{2}} \mathrm{C}
\]
\( \mathrm{P} \)
W
The compound \( \mathrm{D} \) is:
(1) \( \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(2) \( \mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6} \)
(3) \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{5} \)
(4) \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \)


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