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What is redox reaction? Identify the sub...

What is redox reaction? Identify the substance oxidised and the substance reduced in the following reactions.
(a) `Pb_(3)O_(4)+8HClrarr3PbCl_(2)+Cl_(2)+4H_(2)O`
(b) `CuO+H_(2)rarrCu+H_(2)O`
(b) `CuO+H_(2)rarrCu+H_(2)O`

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