Question

Formation of rust on a bicycle rim is a physical or chemical change

Answer 1

Answer:

If you have ever left your bicycle in the rain you probably know it is called rust. Chemical reactions may also produce heat, light, bubbles or color changes. When the bike rusted, the metal turned a different color so we know that a chemical reaction occurred between the bike and the water.

Explanation:

Answer 2

It is a chemical change. It reacts with oxygen and dust particles present in atmosphere and undergoes oxidation and reduction. In this way its get rusted and it is clearly a chemical change.