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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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As it is clear, manganese decrease its oxidation number from +4 to +2. Hence, `MnO_2` gets reduced and it is an oxidising agent. Chlorine atom in HCl increases its oxidation number from -1 to 0. Thus, HCl gets oxidised and it is reducing agent.
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