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Which of the following acids can produce two distinct series of salts?

1. H3PO4
2. H3PO3
3. H3BO3
4. H3PO2

Correct answer: H3PO3

Solution

H3PO3, or phosphorous acid, can donate two protons, allowing it to form two distinct series of salts: one from its diprotic nature and another from its ability to act as a weak acid. This characteristic differentiates it from the other acids listed, which do not exhibit this dual salt formation.

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