MCQ
A standard hydrogen electrode has zero electrode potential because
- AHydrogen atom has only one $e^-$
- BHydrogen is the lightest element.
- ✓Electrode potential is assumed to be zero.
- DHydrogen is easy to oxidise.
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Use : $\frac{{2.303RT}}{F}$ = $0.06$
$(i)\, H_3PO_4+H_2O \rightarrow H_3O^+ + H_2PO_4^-$
$(ii)\, H_2PO 4^- + H_2O \rightarrow HPO_4^{2-} + H_3O^+$
$(iii)\, H_2PO_4^-+ OH^- \rightarrow H_3PO_4 + O^{2-}$
In which of the above does $H_2PO_4^-$ act as an acid ?