Sodium nitrite is reacted with $H_2SO_4$ to form $NaHSO_4$,$HNO_3$,water and $X$. Gold is dissolved in aqua regia to form water,$AuCl_4^{-}$ and $Y$. $X$ and $Y$ are respectively
- A$NO, NO_2$
- B$NO_2, NO$
- C$NO, NO$
- D$N_2O, NO$
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