Final answer:
HBr, HI, and HClO4 are classified as strong acids, while KBr and KI, being the result of an acid-base neutralization reaction, are classified as salts.
Step-by-step explanation:
The compounds HBr, HI, H ClO4, KBr, and KI can be classified according to the Arrhenius theory of acids and bases. HBr, HI, and HClO4 are all strong acids, as they dissociate almost completely in water to produce hydrogen ions (H+). On the other hand, KBr and KI are salts resulting from the neutralization between an acid and a base, and do not fit into the categories of acids or bases under the Arrhenius definition. Therefore, KBr and KI are neither strong nor weak acids or bases.