Multiple choice

Which of the following is diprotic acid?

  1. Phosphomolybdic acid

  2. Phosphotungstic acid

  3. Phosphorous acid

  4. Phosphoric acid
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C Correct answer
Explanation

Phosphorous acid is a compound with the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is as an intermediate in the preparation of other phosphorus compounds.

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