Question

29. Both galvanizing and tinning are adopted for preventing rusting of iron but only tinned iron containers are used to preserve food material. Justify

Answer 1

• The process of applying a coating of tin $\left(\mathrm{Sn}\right)$ on Iron $\left(\mathrm{Fe}\right)$ is called tinning. This process is used to prevent rusting of iron.
• Tin-coated containers are used to preserve edible food materials like oil, meat, vegetables, etc. because tin being a less reactive metal does not react with the components of the food material.
• Galvanization is the process of applying a coating of Zinc $\left(\mathrm{Zn}\right)$ on iron. This method is also used to prevent rusting.
• Since Zinc is a more reactive metal so it reacts with the acids which are present in food items and makes food inedible.