Among the given reactions, only Mg + Cl₂ → MgCl₂ balanced equation represents a redox reaction.
What is redox reaction?
Those reaction in which oxidation and reduction takes place simultaneously or oxidation number changes is known as redox reaction.
(1). Mg + Cl₂ → MgCl₂
In this reaction oxidation state of Mg and Cl is changes from 0 to +2 and 0 to -1 respectively, so this reaction is the redox reaction.
In the second, third and fourth reaction no change in oxidation state of any element observed, so they are not showing redox reaction.
Hence, option (1) is correct i.e. Mg + Cl₂ → MgCl₂ represents redox reaction.
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