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Answer: 2. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

Key idea: only the P-OH hydrogens are acidic.

  • Phosphinic acid \(\mathrm{H_3PO_2}\) has one P-OH, so it is monoprotic.
  • Phosphonic acid \(\mathrm{H_3PO_3}\) has two P-OH, so it is diprotic.

The P-H hydrogens are not ionisable. So option 2 is correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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