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ICSE Class 9 Chemistry Question 14 of 24

Model Question Paper — 2 — Question 8

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Question

Question 4(d)

Define a redox reaction. Give an equation and in it indicate the substance being oxidised and the substance being reduced.

Answer

A chemical reaction which involves, oxidation of one substance and reduction of other substance is called a Redox Reaction.

Considering the reaction of Zinc with copper sulphate:

Zn + CuSO4 ⟶ ZnSO4 + Cu

Zn + Cu2+SO42- ⟶ Zn2+SO42- + Cu

Here, Zinc is oxidised and Copper is reduced.

Oxidation — Zn - 2e- ⟶ Zn2+
Reduction — Cu2+ + 2e- ⟶ Cu