Iron gates of parks or farmlands, iron benches kept in lawns and gardens kept in the open gets rusted. This is an example of which type of change?

Chemical change

The correct answer is option 2. Chemical change

If you leave a piece of iron in the open for some time, it acquires a film of brownish substance.

This substance is called rust and the process is called rusting.

Iron gates of parks or farmlands, iron benches kept in lawns and gardens, almost every article of iron, kept in the open gets rusted.

Iron surface is reacting with oxygen; hence it is a chemical change.