(A) HCIO4 (B) HCN (C) HF (D) HNO2
Solution: Strong electrolytes are substance that can conduct electricity by producing charged particles (ions). Strong acids and bases are strong electrolytes. Strong acid produce hydrogen ions (H+) in water. Here is a list of strong acids that needs to be memorized: HCl, HI, HBr, HNO3, H2SO4, HClO3, HClO4
Since HClO4 is a strong acid, it is a strong electrolyte as well. Choice A is the correct answer choice.
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