Which statement given below is correct regarding dichromate ion?

$\text{ In the reaction between }{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\text{ and }{\mathrm{H}}_2{\mathrm{O}}_2,\text{ oxidising }$$\text{ agent is }{\mathrm{H}}_2{\mathrm{O}}_2$

$\text{ A strong acid changes the }{\mathrm{CrO}}_4^{2-}\text{ ion to the }{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\mathrm{ion}$

$\text{ In an acidic medium, the }{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\text{ ion behaves as reducing agent}$

$$\begin{gathered} \text{ In the reaction between }{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\text{ and }{\mathrm{H}}_2{\mathrm{O}}_2,\text{ solution colour changes from orange of dichromate ion} \\ \mathrm{through} \mathrm{green} \mathrm{to} \mathrm{the} \mathrm{blue} \mathrm{of} \mathrm{the} {\mathrm{Cr}}^{3+} \mathrm{ion} \end{gathered}$$