**Category:** Inorganic Chemistry  
**Subtype:** Chemical Reactions  
**Problem Description:** Identify the two substances (X and Y) that react with concentrated hot sulfuric acid (\(\mathrm{H}_{2} \mathrm{SO}_{4}\)) to produce 1 mole of sulfur dioxide (\(\mathrm{SO}_{2}\)) as the only reduction product. The problem involves determining the correct pair of iron oxides from the given options.