The basicity of $\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3, \mathrm{H}_3 \mathrm{PO}_4$…

The basicity of $\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3, \mathrm{H}_3 \mathrm{PO}_4$ respectively is
  1. $2,2,3$
  2. $2,3,3$
  3. $1,3,3$
  4. $1,2,3$

Asked in: AP EAMCET 2024 (22 May Shift 2)

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