Question

Define Reduction.with example​

Answer 1

reduction involves a half reaction in which a chemical species decreases its oxidation number usually by gaining electrons....
here oxidation is the gain of oxygen and reduction is loss of oxygen an old less common definition of oxidation and reduction is examines the reaction in terms of protons and hydrogen.
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Answer 2

Losing of oxygen or gaining of one or more electron is called reduction

Example- H2 +F2 = 2HF

H2 =2H+ +2e-

F2 +2e- =2F-