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Substances which take part in a chemical reaction are called reactants. These are on left hand side of the chemical equation...
For Example - Burning of magnesium in air to form magnesium oxide..
     Magnesium + Oxygen   ⇒  magnesium oxide
Here, magnesium and oxygen are two reactants
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Reactants are those compounds or metals or elements which take part in chemical reaction and are present or is written in the left side of a chemical equation.
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