Which of the following is classified as a weak electrolyte?

HCl
NaOH
NH₃
K₂SO₄

📝 Detailed explanation

NH₃ (ammonia) is a weak base that only partially ionizes in water. HCl and NaOH are a strong acid and a strong base, respectively, and K₂SO₄ is a soluble salt; all three are strong electrolytes.

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