| $X$ | $Y$ |
| सांद्र $HNO_3$ | $H_2SO_4(SO_3)$ |
| $X$ | $Y$ |
| सांद्र $HNO_3$ + सांद्र $H_2SO_4$ / $333 \ K$ | $H_2SO_4(SO_3)$ |
| $X$ | $Y$ |
| $NaNO_2$ / $HCl$ | $H_2SO_4$ |
| $X$ | $Y$ |
| तनु $HNO_3$ | $SO_3$ |
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