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\( \mathrm{Na} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow} A \stackrel{\mathrm{CO}_{2}}{\longrightarrow} B \stackrel{\mathrm{SO}_{2}}{\longrightarrow} C \stackrel{\mathrm{Na}_{2} \mathrm{~S} / \mathrm{I}_{2}}{\longrightarrow} D \stackrel{\mathrm{Ag}^{+} / \text {salt }}{\longrightarrow} E \) (complex)
The compound \( B \) and \( C \) are :
(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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