Answer:- [tex]Ra(OH)_2[/tex] and CsOH .
Explanations:- [tex]Ra(OH)_2[/tex] and CsOH have [tex]OH^-[/tex] and so when dissolved in water, they give [tex]OH^-[/tex] and hence they are bases.
[tex]H_2C_2O_4[/tex] and HI gives [tex]H^+[/tex] when dissolved in water and so these are acids.
The equations are shown as below:
[tex]Ra(OH)_2(aq)\rightarrow Ra^2^+(aq)+2OH^-(aq)[/tex]
[tex]CsOH(aq)\rightarrow Cs^+(aq)+OH^-(aq)[/tex]
[tex]H_2C_2O_4(aq)\rightarrow 2H^+(aq)+C_2O_4^2^-(aq)[/tex]
[tex]HI(aq)\rightarrow H^+(aq)+I^-(aq)[/tex]