Question

2. When we keep a piece of iron in the open area for few days, a brownish, flaky
substance, called rust, is deposited on it.
(a) Is formation of rust from iron a chemical change? Justify.
(b) Write the chemical formula of rust.
(1​

Answer 1

Answer:

The formation of rust is a chemical change. As, there are two substances reacting together to make a new substance.

The chemical form of rust Fe2O3•32H2O