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P-1 Chemical reactions and equations — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-1 Chemical reactions and equations2 Marks
Question
Choose the correct option from the bracket andexplain the statement giving reason:
To prevent rusting, a layer of ____________ metal is applied on iron sheets.
(zinc ,copper,aluminium)
✓

Answer

zinc
Explanation: Due to moisture and various components of atmosphere, oxidation of iron takes place. A certain type of reddish coloured solid layer collects on the iron surface. This layer is called rust. Its chemical formula is $Fe_2O_3 \times H_2O$. To avoid rusting a layer zinc metal is applied on iron sheets which provides iron sheets to directly come in contact with the atmosphere and hence prevents rusting. This process of giving a thin coating of zinc and iron to protect it from rusting is called galvanisation.

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