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\( \mathrm{Na} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow} \mathrm{a} \stackrel{\mathrm{CO}_{2}}{\longrightarrow} \mathrm{B} \stackrel{\mathrm{SO}_{2}}{\longrightarrow} \mathrm{C} \stackrel{\mathrm{Na}_{2} \mathrm{~S} / \mathrm{I}_{2}}{\Delta} \mathrm{D} \stackrel{\mathrm{Ag}^{+} / \mathrm{salt}}{\longrightarrow} \mathrm{E} \) (complex)
\( \mathrm{P} \)
The compound \( \mathrm{D} \) is :
W
(A) \( \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(B) \( \mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6} \)
(C) \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{5} \)
(D) \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \)
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