Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?
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Solution
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 broken easily into smaller pieces.
But the strength of inter-molecular force of attraction is very strong in coal, therefore it is not possible to break them into small pieces.
Concept: Change of State of the Matter on the Basis of Inter Particle Space and Inter Particle Attraction and Collision
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