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What is redox reactions ? Identity the s...

What is redox reactions ? Identity the substance oxidised and the substance reduced in the following reactions :
`MnO_(2)+4HCl to MnCl_(2)+2H_(2)+Cl_(2)`

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Chemical reaction in which both oxidation and reduction takes place simultaneously are called Redox reactions.
`MnO_(2)` is reduced to `MnCl_(2)` and HCl is oxidised to `H_(2)O` .
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