Question

We cant rejoin the broken chalk easily. Give reason

Answer 1

We can't rejoin a broken chalk because it is made of calcium carbonate and it is very thick too.
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Answer 2

Chalk is one of the most commonly found objects in educational sectors like school and college.

Chalk is generally made out of calcium carbonate,which is a hard substance in it's normal state.

Due to this hardness ,the remoulding and rejoining proceses are very tough,requires lot of works to do so.