$A$ colourless,neutral,paramagnetic oxide of nitrogen '$P$' on oxidation gives reddish brown gas $Q$. $Q$ on cooling gives colourless gas $R$. $R$ on reaction with $P$ gives blue solid $S$. Identify $P, Q, R, S$ respectively.
- A$N_2O, NO, NO_2, N_2O_5$
- B$N_2O, NO_2, N_2O_4, N_2O_3$
- C$NO, NO_2, N_2O_4, N_2O_3$
- D$NO, NO, N_2O_4, N_2O_5$
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