All combustion reactions are oxidation-reduction reactions.
If true enter 1, else enter 0.
1

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Solution

The correct option is A 1
All combustion reactions are oxidation-reduction reactions.
For example, the combustion of oxygen is given by the following reaction:
$C + O_{2} \to C O_{2}$
The oxidation number of elemental C and oxygen are 0 each.
The oxidation number of C in $C O_{2}$ is +4 and the oxidation number of O in $C O_{2}$ is -2.
Thus, C is oxidized and O is reduced.
Hence, the combustion reaction is oxidation-reduction reaction.

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