1.

The chenge which goes only one direction

Answer»

An irreversible change. Explanation:In an irreversible change , when the contents of a SUBSTANCE is used up in a REACTION with another substance , it's original form cannot be obtained,and hence , it is a one-direction change.Example : Burning of paper.Paper becomes ASH  when burned ,but we cannot obtain paper by REVERSING the  process.A request:Plz mark my answer as brainliest if you think this is the correct answer.



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