Class 10 Chemistry Chemical Reactions and Equations Introduction

Whenever lime is mixed with water we get a clear solution with and on touching the tube it feels hot. That is lime when mixed with water undergoes certain physical changes that makes it evolve heat and give a clear solution.

Similarly, the iron articles undergoes physical changes and develops a layer of rust on its surface.  It reacts with the oxygen present in air and moisture and develops rust (hydrated iron (III) oxide).

These are all chemical reactions. 

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