<u>Answer:</u>
<em>Yes, Al change oxidation number</em>
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<u>Explanation:</u>

For a free element, oxidation number is 0.
Na and Al are free elements we find in the equation as they are not in combination with other elements.
For a compound, the sum of oxidation number of elements = 0.
We know oxidation number of chlorine is -1.
So let us find the oxidation number of Al in 
Let x be the oxidation number of Al so,

Oxidation number of Al in
is +3
Oxidation number of Al changes from +3 to 0.
Decrease in oxidation number indicates
is getting reduced in the reaction.
Na oxidation number increases from 0 to +1 shows Na is getting oxidised in the reaction
The change in oxidation number of the elements represents a redox reaction where both oxidation and reduction takes place simultaneously.