Define rusting. What type of change is it?

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Solution

Rust is nothing but Iron Oxide; a new substance formed out of the reaction.
The colour of the surface of the iron also changes.
Hence, rusting of iron is a chemical change.
$4 Fe + 3 O_{2} + x H_{2} O \to 2 {Fe}_{2} O_{3} . x H_{2} O$

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Define rusting. What type of change is it?

Rust is nothing but Iron Oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.4Fe+3O2+xH2O​→2Fe2O3.​xH2O

Rust is nothing but Iron Oxide; a new substance formed out of the reaction.
The colour of the surface of the iron also changes.
Hence, rusting of iron is a chemical change.
$4 Fe + 3 O_{2} + x H_{2} O \to 2 {Fe}_{2} O_{3} . x H_{2} O$