MCQ
The pair likely to form the strongest hydrogen bonding is
- A$CH_4\,\,$ and $\,\,H_2O$
- ✓$HCOOH\,\,$ and $\,\,CH_3COOH$
- C$CH_3COOH\,\,$ and $\,\,CH_3COOCH_3$
- D$SiH_4\,\,$ and $\,\,SiCl_4$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$(i)\, H_3PO_4+H_2O \rightarrow H_3O^+ + H_2PO_4^-$
$(ii)\, H_2PO 4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^+$
$(iii)\, H_2PO_4^-+ OH^- \rightarrow H_3PO_4 + O^{2-}$
In which of the above does $H_2PO_4^-$ act as an acid ?