Question

It is easy to burn paper than a paper crumbled ball give reason

Answer 1

because of large surface area , fire spreads quickly on a plane paper rather than a crumbled ball of paper .
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Answer 2

Crumbled I would suggest. Fire needs oxygen, which is why closely packed sheets of paper will smoulder at the edges but not burst into flames. Crumpled paper will have air (oxygen) trapped in it so will burn and burst into flame quickly