Question

take an iron nail a piece of chalk and a rubber band try breaking them by hammering cutting or streatching

Answer 1

Hii mate here is the answer to your question
If you take an iron nail, a piece of chalk and a rubber band and try to break them by hammering , stretching or cutting the iron nail will be the most harder one to break since the intermolecular spaces are very less and the intermolecular force of attraction is relatively strong
hope this helps
keep smiling

Answer 2

Answer: The iron nail.

How?

It is because in an iron nail the particles are tightly bond and the molecules have a great force of attraction between itself which helps the nail to be hard and hence it requires greater force to damage it.

Hope this helps....