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Uses of zinc metal

Answer Text:
Uses of zinc:
1. Galvanization of iron sheets to prevent corrosion and rusting.
Note:
Rusting does not occur even when galvanized iron sheets are scratched and exposed.
Reason:
- The rest of the zinc protects the iron from rusting. This is because zinc being more reactive gets oxidized in preference to iron, and is hence “ sacrificed” in the protection of iron.
- This method is referred to as cathodic or sacrificial protection.
2. Making brass; an alloy of copper and zinc.
3. Making outer casings of dry batteries;
4. Die-castings contain zinc and aluminium, and are used for making radio and car parts;
5. Zinc cyanide is used for refining silver and gold;