In, Na+H2O⟶Na++12H2;Na is not Arrhenius acid because it is an element and not a compound. If true write 1, else write 0.
Arrhenius acid : Substance which gives H+ ion on dissolving in water (H+ donor).
Na+H2O⟶Na++12H2
So here Na is not a acid as it doesnt give any hydrogen ion.