Q.2
Sulphur resistant lacqued cans contains
- Sulfur-Resistant (SR) Can Lacquers:
- Marine seafoods (shrimp, crab, tuna, salmon) are rich in sulfur-containing amino acids (cysteine, methionine) that thermal retorting breaks down into volatile hydrogen sulfide ($H_2S$).
- Hydrogen sulfide reacts with unprotected tinplate iron to form unsightly black iron sulfide ($FeS$) stains.
- Role of Zinc Oxide: Sulfur-resistant (SR) lacquers incorporate Zinc Oxide ($ZnO$) powder. During processing, $ZnO$ reacts with $H_2S$ to produce Zinc Sulfide ($ZnS$), which is completely white and invisible, preventing dark sulfur staining.
- Correct Option: Option 2 (Zinc Oxide).
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