An oxidation-reduction (redox) reaction is a chemical reaction that involves a transfer of electrons between two species. Simple way to remember redox reaction is that oxidation is loss and reduction is gain.
How to determine oxidized and reduced elements in a chemical reaction?
Balanced chemical reaction is.
2Li + 2HCl --> 2LiCl + H2
Now, products are, LiCl and H2
Element oxidized is Li because it loses electron to form Li+
Element reduced is H of HCl to form H2 because H in HCl in +1 oxidation state gains one electron to form H2 in zero oxidation state.
Element which is oxidizing agent is one which gets reduced i.e., H of HCl
Element which is reducing agent is one which gets oxidized i.e., Li.
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