Why is that when a metal reacts with a non-metal, the reaction is always a redox reaction?
 

 redox means -- oxidation and reduction at the same time. there is a new definition for oxidation and reduction. if an atom loses elctrons then it is oxidized and if an atom gains electrons it is reduced.
so, when a metal and a non metal react, there is an ionic bond formed, which means 1 loses electrons while the other gains them. so, since this reaction involves the exchange of electrons , so it is termed as a redox reaction

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 how to bioology

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is the defnition of oxidized and reduced is correct

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it is the property of it so

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WHEN A METAL REACTS WITH NON METAL THEN IT FORM ACIDIC SOLUTION

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the non-metal will always reduce and a metal will always oxidised and a reaction in which oxidation and reduction both occur is called a redox reaction

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the non-metal will always reduce and a metal will always oxidised and a reaction in which oxidation and reduction both occur is called a redox reaction

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when the metal reacts  with a non metal it is a redox reaction because it is said that when a reaction looses or gains hydrogen and when the reation looses or gains oxygen is known as redox reaction.

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