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keikeikei
answer is (2) HCl
It' an Arrhenius acid because it dissociates in aqueous solution to form hydrogen ions (H+).
Billymkhoi
According to Arrhenius Theory about acids and bases, acids dissolve in water to yield H+. In the four options above, only HCl can do that. Thus, (2) HCl is the answer.
Hope this would help :))

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