Question

(1) What are redox reactions? Identify the substances that are oxidised and substances that are reduced in the following reactions :
(a) 2H2S+ SO2 – 3s+2H2O

(b) Cuo + H2 – Cu + H2O
(c) Mno2 + 4HCI – MnCl2 +
2H20 + C12
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Answer 1

Answer:

Redox reactions are the reactions in which one element of a reactant gets oxidised and another element of the reactant gets reduced.The element reduced or oxidised can be checked by comparing its oxidation no. In the reactant side and in the product side .

a) Sulphur is oxidised in this as its oxidation state changes from -2 to 0(as the oxidation state of elemental state of a elment is 0) and hydrogen is reduced as its oxidation state changes from +2 to +1

b) copper is reduced here as its oxid state changes from +2 to 0.and hydrogen is oxidised as its oxid state changes from 0 to +1.

c) manganese is reduced bere as its oxid state changes from +4 to +2.and chlorine gets oxidised as its oxid state changes from -1 to 0(0 is the oxidation state of chlorine of Cl2 )

Explanation: