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Which of the following cannot act both as Bronsted acid and as Bronsted base?

1. HSO4⁻
2. HCO3⁻
3. NH3
4. HCl

Correct answer: HCl

Solution

HCl is a strong acid and can only donate a proton (H⁺), making it a Bronsted acid. It cannot accept a proton, so it cannot act as a Bronsted base.

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