Question

Is formation of coal a physical change or chemical change

Answer 1

formation of coal is physical change and even chemical change
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Answer 2

It's a chemical change because when animals fossilise when they die they form fossil fuels and coal is one of them.
In chemical change new substances are formed and the change is irreversible so in formation of coal new substances are formed and it's not reversible means we can not get the original form again.