Q12 of 35 Page 42

Give two examples for oxidation-reduction reaction. (AS1)

Oxidation – reduction reaction: When oxidation and reduction takes place at the same time, then the reaction is called oxidation-reduction reaction.

Oxidation: losing of electrons Reduction: gaining of electrons


For example:


CuO + H2→ Cu + H2O


⇒In the reaction, CuO loses oxygen atom which means that reduction of CuO (copper oxide) takes place.


⇒H2 (hydrogen) takes up oxygen atom.


⇒As a result, formation of water takes place. This means hydrogen undergoes oxidation.


Another example:



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