What is redox reaction?Identify the substance oxidised and the substance reduced in the following reactions: a}PB3O4+8HCI arrow 3PBCL2+CL2+4H2O b}CUO+H2 arrow CU+H2O

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Solution

The redox reactions can be defined in the following ways.

1)Redox reactions are the reactions in which the oxidation and reduction process are carried out simultaneously i.e. one reactant is getting reduced by gaining of electrons while the other gets oxidized by loosing of electrons.

2) Redox reactions can be defined as the reactions in which one of the reactant gains oxygen or loss hydrogen gets oxidized and the other substance gains hydrogen or loss oxygen get reduced.
1. Pb₃O₄ + 8HCl →3PbCl₂ + Cl₂ + 4H₂O
Here Pb is losing O from Pb₃O₄and form PbCl₂ hence Pb is reduced.
Cl is losing H from HCl and forming Cl₂ hence Cl is oxidised.
2. CuO + H₂→ Cu + H₂O
Copper is losing oxygen from CuO hence Cu is reduced
H₂ is gainig O to form H₂O hence it is oxidized

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