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Chapter 4: Q4.85P (page 181)

Are all combustion reactions redox reactions? Explain

Short Answer

Expert verified

You need to explain that all the combustion reactions are redox reactions.

Step by step solution

01

General Combustion Reaction

2COg+O2g→2CO2g

02

Oxidation of carbon in CO

Oxidation no of oxygen is -2.

Let assume, oxidation no of carbon in CO is x.

Now you can write,

x+-2=0x=+2

03

Oxidation no of carbon in CO2

Oxidation no of oxygen is -2.

Let assume, oxidation no of carbon in CO2 is y.

Now you can write,

y+2-2=0y=+4y+2-2=0y=+4

04

Oxidation no of oxygen

The oxidation no of oxygen in O2 is 0.

The oxidation no of oxygen in CO2 is -2.

05

Conclusion

In a combustion reaction,

The oxidation no of oxygen is 0 in O2 decreases to -2 in CO2. Therefore, O2 undergoes reduction.

The oxidation no of carbon is +2 in CO increases to +4 in CO2. Therefore, CO undergoes oxidation.

Hence, all combustion reactions are redox reaction.

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