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\( \mathrm{NH}_{3}+\mathrm{O}_{2} \underset{\Delta}{\stackrel{\mathrm{Pt}}{\longrightarrow}} A+\mathrm{H}_{2} \mathrm{O} \)
P
\[
\begin{array}{l}
A+\mathrm{O}_{2} \longrightarrow B \\
B+\mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow C
\end{array}
\]
W
\( A, B \) and \( C \) are:
(a) \( \mathrm{N}_{2} \mathrm{O}, \mathrm{NO}_{2} \) and \( \mathrm{HNO}_{3} \)
(b) \( \mathrm{NO}, \mathrm{NO}_{2} \) and \( \mathrm{HNO}_{3} \)
(c) \( \mathrm{NO}_{2}, \mathrm{NO} \) and \( \mathrm{HNO}_{3} \)
(d) \( \mathrm{N}_{2} \mathrm{O}, \mathrm{NO} \) and \( \mathrm{HNO}_{3} \)
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