Question

Give two examples of a redox reaction. Write the names of the oxidising and reducing agents in that redox reaction.

Answer 1

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Those chemical reactions in which oxidation and reduction take place with together are called redox reactions.

For example- CuO + H2 arrow Cu + H2O

CuO and Cu removal of O2.

The substance which gives oxygen for oxidation is called oxidising agent.

The substance which gives hydrogen for reduction is called reducing agent.

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Answer 2

1. A redox reaction is a chemical reaction in which electrons are transferred between the two reactants involved.
2. This electron transfer can be identified by the change in oxidation states of the reacting species.
3. Oxidizing agents are those that increase the oxidation number of another compound while decreasing their own oxidation number.
4. Reducing agents are those that reduce the oxidation number of another compound while increasing their own oxidation number.

Example 1

The hydrogen in the reaction with fluorine is oxidised, while the fluorine is reduced.

$H_{2} + F_{2}\to 2HF$

The oxidation half-reaction is: $H_{2}\to 2H^{+} + 2e^{-}$

The reduction half-reaction is: $F_{2}+ 2e^{-}\to 2F^{-}$

Hydrogen fluoride is formed after the hydrogen and fluorine ions combine.

Hence, the oxidising agent is fluorine and the reducing agent is hydrogen.

Example 2

Zinc displaces the $Cu^{2+}$ ion in the copper sulphate solution in this metal displacement reaction.

$Zn (s) + CuSO_{4}(aq)\to ZnSO_{4} (aq) + Cu (s)$

The oxidation half-reaction can be written as: $Zn\to Zn^{2+} + 2e^{-}$

The reduction half-reaction can be written as: $Cu_{2}+2e^{-}\to Cu$

In a redox reaction, zinc displaces copper from the copper sulphate solution.

Hence, the oxidising agent is copper and reducing agent is zinc.

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