Question
In the following sequence of reaction, identify the compounds $$(A), (B), (C)$$ and $$(D) :$$
\[\underset{\text{Solution}}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,\xrightarrow{S{{O}_{2}}}\left( A \right)\xrightarrow{N{{a}_{2}}C{{O}_{3}}}\] \[\left( B \right)\xrightarrow[\text{Heat}]{S}\left( C \right)\xrightarrow{AgN{{O}_{3}}}\left( D \right)\]
A.
$$N{a_2}S{O_3},NaHS{O_3},N{a_2}S,A{g_2}S$$
B.
$$NaHS{O_3},N{a_2}S{O_3},N{a_2}{S_2}{O_3},A{g_2}S$$
C.
$$NaHS{O_3},N{a_2}S{O_4},N{a_2}S,A{g_2}O$$
D.
$$N{a_2}S{O_3},N{a_2}S{O_4},N{a_2}{S_2}{O_3},Ag$$
Answer :
$$NaHS{O_3},N{a_2}S{O_3},N{a_2}{S_2}{O_3},A{g_2}S$$
Solution :
\[\begin{align}
& N{{a}_{2}}C{{O}_{3}}+2S{{O}_{2}}+{{H}_{2}}O\to \underset{\left( A \right)}{\mathop{2NaHS{{O}_{3}}}}\,+C{{O}_{2}} \\
& \underset{\left( A \right)}{\mathop{2NaHS{{O}_{3}}}}\,+N{{a}_{2}}C{{O}_{3}}\to \underset{\left( B \right)}{\mathop{2N{{a}_{2}}S{{O}_{3}}}}\,+{{H}_{2}}O+C{{O}_{2}} \\
& \underset{\left( B \right)}{\mathop{2N{{a}_{2}}S{{O}_{3}}}}\,+S\xrightarrow{\text{Heat}}\underset{\left( C \right)}{\mathop{2N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\, \\
& N{{a}_{2}}{{S}_{2}}{{O}_{3}}+AgN{{O}_{3}}\to \underset{\left( D \right)}{\mathop{A{{g}_{2}}S}}\,+{{H}_{2}}S{{O}_{4}} \\
\end{align}\]