Question

Identify the substances that are oxidised and reduced in the reaction 4na+o2->2na2o

Answer 1

Reaction: 4Na + O₂ → 2Na₂O

• Oxidised substance: Na (Sodium)

• Reduced substance: O₂ (Oxygen)

Oxidation Reaction

The reaction where a substance gets oxidised is called Oxidation Reaction.

Reduction Reaction

The reaction where a substance gets reduced is called Reduction Reaction.

The reactions where both reduction and oxidation takes place are called Redox Reaction.

Answer 2

Oxidised Substance : Na

Reduced Substance : O2

Reduction :

The reduction reactions takes place if any of the following happens :

• Addition of Hydrogen

• Removal of Oxygen

• Decrease in oxidation number

• Loss of ions

And the substance that gives hydrogen, removes oxygen, helps in decreasing the oxidation number or is responsible for loss of ions is known as reducing agent.

Oxidation :

The oxidation reactions takes place if any of the following happens :

• Addition of Oxygen

• Removal of Hydrogen

• Increase in oxidation number

• Gain of ions

And the substance that gives oxygen, removes hydrogen, helps in increasing the oxidation number or is responsible for gain of ions is known as oxidising agent.

Redox Reaction :

The reaction in which both oxidation and reduction takes place is Redox Reaction.

Example :

2Na + Cl → 2NaCl