Pure $HNO_3$ is colorless. However,it turns slightly brown when exposed to light due to its decomposition into $.....$.
- A$NO$ and $NO_2$
- B$NO_2$ and $O_2$
- C$NO$ and $O_2$
- D$N_2O_5$ and $O_2$
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The number of $P-OH$ bonds and the oxidation state of the phosphorus atom in pyrophosphoric acid $(H_4P_2O_7)$ respectively are
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