Referring to the following reactions the missing products \( A, B, ...
0Referring to the following reactions the missing products \( A, B, C \) and \( D \) respectively are :
\( \mathrm{P} \)
\[
\begin{aligned}
\mathrm{NH}_{4} \mathrm{Cl}(a q .)+\mathrm{NaNO}_{2}(a q .) & \longrightarrow[A]+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{NaCl}(a q .) \\
\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} & \stackrel{\Delta}{\longrightarrow}[B]+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Cr}_{2} \mathrm{O}_{3}(s) \\
\mathrm{Cu}+\mathrm{HNO}_{3} \text { (dilute) } & \longrightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+[C]+\mathrm{H}_{2} \mathrm{O}(l) \\
\mathrm{Cu}+\mathrm{HNO}_{3} \text { (concentrate) } & \longrightarrow \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+[D]+\mathrm{H}_{2} \mathrm{O}(l)
\end{aligned}
\]
(a) \( \mathrm{N}_{2}, \mathrm{~N}_{2}, \mathrm{NO}, \mathrm{NO}_{2} \)
(b) \( \mathrm{N}_{2}, \mathrm{NH}_{3}, \mathrm{~N}_{2}, \mathrm{NO} \)
(c) \( \mathrm{N}_{2}, \mathrm{~N}_{2}, \mathrm{NO}_{2}, \mathrm{NO}_{2} \)
(d) \( \mathrm{N}_{2}, \mathrm{NH}_{3}, \mathrm{NO}_{2}, \mathrm{~N}_{2} \mathrm{O}_{4} \)
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