Rusting of iron is a chemical change because ______?

لوہے کا زنگ آلود ہونا ایک کیمیائی تبدیلی ہے کیونکہ ______؟

The iron remains unchanged

A new substance (iron oxide) is formed

It is a reversible reaction

None of these

Rusting is a chemical change where iron reacts with oxygen and moisture to form iron oxide (rust).

Since a new substance is created, it is classified as a chemical change.