Question

Assertion (A): Combustion of a substance is redox reaction
Reason (R): This is because both reduction and oxidation takes place in combustion.
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Answer 1

All combustion reactions are oxidation-reduction reactions.

For example, the combustion of oxygen is given by the following reaction:

C+O2→CO2

The oxidation number of elemental  C and oxygen are 0 each.

The oxidation number of C in CO2 is +4 and the oxidation number of O in CO2 is -2.

Thus, C is oxidized and O is reduced.

Hence, the combustion reaction is oxidation-reduction reaction.

Hence , it is option a.

Answer 2

Both the assertion and reason are correct.

Assertion states that combustion of a substance is redox reaction.

• A combustion reaction is a kind of redox reaction that occurs when a matter combines with molecular oxygen to make oxygen-containing compounds of other elements in the reaction.
• One example is when the methane is burnt, the principal constituent of natural gas.
• In respiration, the biochemical procedure by which the oxygen that we breathe in in air oxidizes food to carbon dioxide and water, redox reactions give energy to living cells.

Reason states that this is because both reduction and oxidation takes place in combustion.

• For instance, the combustion of oxygen is given by the following reaction:
• C+O2→CO2
• The oxidation figure of elemental C and oxygen are 0 each.
• The oxidation number of C in CO2 is +4 and the oxidation figure of O in CO2 is -2.

• Thus, C is oxidized and O is reduced.

Hence, each and every one combustion reactions are oxidation-reduction reactions.

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