HBr is the acid in the given KOH + HBr → KBr + H₂O reaction.
According to the Arrhenius theory of acids and base, acids are those substances which gives proton or H⁺ ion to the solution.
Given chemical reaction is:
KOH + HBr → KBr + H₂O
KOH will break into K⁺ ion and OH⁻ ion and HBr will dissociates into H⁺ ion and Br⁻ ion. From this it is clear that HBr is an acid as it gives H⁺ ion to the solution for the formation of water molecule and potassium bromide.
Hence, HBr is an acid.
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