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Conjugate base for Brønsted acids H2O and HF are:

1. OH⁻ and H2F⁺, respectively
2. H3O⁺ and F⁻, respectively
3. OH⁻ and F⁻, respectively
4. H3O⁺ and H2F⁺, respectively

Correct answer: OH⁻ and F⁻, respectively

Solution

The conjugate base of a Brønsted acid is formed by removing one proton (H⁺) from the acid. For H2O, removing H⁺ gives OH⁻, and for HF, removing H⁺ gives F⁻.

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