`BaO_(2)+H_(2)SO_(4) rarr BaSO_(4)+H_(2)O_(2)`
In the above method of preparation of `H_(2)O_(2)`, now-a-days `H_(3)PO_(4)`(conc.) is used instead of conc. `H_(3)SO_(4)` because :
A. `H_(2)SO_(4)` catalyses the backward reaction
B. `H_(2)SO_(4)` catalyses the decomposition of `H_(2)O_(2)`
C. `H_(3)PO_(4)` catalyses the backward reaction
D. none of the above
