\[ \begin{array}{l} \text { A } \stackrel{\Delta}{\longrightarrow} ...
0\[
\begin{array}{l}
\text { A } \stackrel{\Delta}{\longrightarrow} \mathrm{B} \text { (oxide) }+\mathrm{CO}_{2} \\
\mathrm{~B}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{C} \\
\mathrm{C}+\mathrm{CO}_{2} \longrightarrow \mathrm{A} \text { (milky) } \\
\mathrm{C}+\mathrm{NH}_{4} \mathrm{Cl} \stackrel{\Delta}{\longrightarrow} \mathrm{D} \text { (gas) } \\
\mathrm{D}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \longrightarrow \mathrm{E} \\
\mathrm{E}+\mathrm{NaCl} \longrightarrow \mathrm{F} \\
\mathrm{F} \stackrel{\Delta}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \\
\end{array}
\]
\( \mathrm{P} \)
W
\( \mathrm{D}, \mathrm{E} \) and \( \mathrm{F} \) are :
(A) \( \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NH}_{4} \mathrm{HCO}_{3} \)
(C) \( \mathrm{NH}_{4} \mathrm{HCO}_{3}, \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NaHCO}_{3} \)
(B) \( \mathrm{NH}_{3}, \mathrm{NH}_{4} \mathrm{HCO}_{3}, \mathrm{NaHCO}_{3} \)
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