Question

a piece of chalk can be broken into small particles on hammering but it is not possible to do so it in case of the peace or a bar of iron explain

Answer 1

The the particles of matter have force acting between them this post keeps the particles to other the magnitude of this force is lesser in stock hence it could be easily broken down into pieces on hammering whereas the magnitude of this intermolecular force is more in iron hence it cannot be broken into small pieces on hammering

Answer 2

The particles of matter have force acting between them. This force keeps the particles together. The strength of this force of attraction is lesser in chalk, hence it could be easily broken into small pieces by hammering. But the strength of inter molecular force of attraction is very strong in iron therefore it is not possible to break them into small pieces by hammering.
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