$A$ tetra-atomic molecule $(A)$ on reaction with excess oxygen produces substance $(B)$. $(B)$ is a dehydrating agent. The substances $(A)$ and $(B)$ respectively will be:
- A$P_4, P_4O_{10}$
- B$P_4, N_2O_5$
- C$P_4, P_2O_3$
- D$P_2, P_2O_3$
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