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\[
\mathrm{Na} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow} \mathrm{a} \stackrel{\mathrm{CO}_{2}}{\longrightarrow} \mathrm{B} \stackrel{\mathrm{SO}_{2}}{\longrightarrow} \mathrm{C} \stackrel{\mathrm{Na}_{2} \mathrm{~S}_{2}}{\Delta} \mathrm{D} \stackrel{\mathrm{Ag}^{+} / \text {salt }}{\longrightarrow} \mathrm{E} \text { (complex) }
\]
\( \mathrm{P} \)
The compound \( \mathrm{B} \) and \( \mathrm{C} \) are:
W
(A) \( \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(B) \( \mathrm{NaHCO}_{3}, \mathrm{Na}_{2} \mathrm{SO}_{4} \)
(C) \( \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{Na}_{2} \mathrm{SO}_{3} \)
(D) None of these
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