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Which one of the following compound is a strong electrolyte?

Question and options

Which one of the following compound is a strong electrolyte?
  1. C6H5−NH2\mathrm{C_6H_5{-}NH_2}
  2. NH4OH\mathrm{NH_4OH}
  3. HCOOH\mathrm{HCOOH}
  4. KCl\mathrm{KCl}

Answer and explanation

Correct answer: D - \(\mathrm{KCl}\)
KCl is an ionic salt that dissociates completely in water, a strong electrolyte. Aniline, NH4OH\mathrm{NH_4OH} and formic acid are weak.

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