Question

Name the reducing agent in the following reaction: 3MnO2 + 4Al———— > 3Mn + 2Al2O3 State which is more reactive, Mn or A1 and why?

Answer 1

In this reaction Al (Aluminium is the reducing agent).

Aluminium is more reactive than Mn because Al is displacing Mn from it's compound.

More about reduction and oxidation:-

• Oxidation:- The process in which a substance gains oxygen or loses hydrogen is known as Oxidation.
• Oxidizing agent:- Oxidizing agent is a substance which gives oxygen or removes hydrogen and cause the oxidation of other substances.

• Reduction:- The process in which a substance reduces oxygen or gains hydrogen is known as reduction.
• Reducing agent:- A reducing agent is a substance which gives hydrogen or removes oxygen and causes reduction of other substances.

1. Consider the reaction:- CuO + H2 -----> Cu + H2O

• In this reaction, hydrogen removes oxygen from copper oxide. Thus CuO is reduced and hydrogen behaves as reducing agent.
• In the same reaction Copper oxide gives oxygen to hydrogen and hydrogen is oxidized to water by CuO. Therefore CuO is acting as oxidizing agent.

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Answer 2

Answer:

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'Al' is reducing agent.

'AT' is more reactive than Mn v ‘Al’ displaces Mn from its oxide.