MCQ
Consider the following reaction sequence,


- A$A,B,D$
- ✓$A,B,C$
- C$A,B$
- D$A,D$


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$I.$ $Zn +$ conc. $HNO_3$ (hot) $\rightarrow Zn(NO_3)_2 + X + H_2O$
$II.$ $Zn +$ dil. $HNO_3$ (cold) $\rightarrow Zn(NO_3)_2 + Y + H_2O$
Compounds $X$ and $Y$ are respectively