question_answer 12)

Explain how painting of an iron gate prevents it from rusting.

Answer:

Rusting of iron is due to the exposure of iron to the atmosphere for sometime. To prevent rusting of iron gate, we paint it. Painting prevents the iron gate to come in direct contact of atmosphere, water or both. Thus, a coat of paint cuts the contact between iron and atmosphere and it prevents rusting of iron. Also we know that \[\text{Iron}(Fe)+\text{Oxygen}({{O}_{2}})+\text{Water}\,\left( {{H}_{2}}O \right)\xrightarrow[{}]{{}}\]\[\text{Rust}(\text{ironoxide},F{{e}_{2}}{{O}_{3}})\] Thus, it is necessary to cut the oxygen contact with iron to prevent rusting.