question_answer

What name is given to process of rusting of an article made up of iron and what type of change is it?

Answer:

                  The process is called corrosion and it is a chemical change because rust is a chemical compound (hydrated iron    oxide, \[F{{e}_{2}}{{O}_{3}}\cdot x{{H}_{2}}O\]) totally different from element iron. The reaction is \[4Fe+3{{O}_{2}}+x{{H}_{2}}O\xrightarrow[{}]{{}}\underbrace{2F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O}_{\text{Rust}}\]