During the electrolysis of higher concentration of $H_2SO_4$,the product obtained at anode is . . . . . . .
- A$O_{2_{(g)}}$
- B$H_2S_2O_{8_{(aq)}}$
- C$SO_{2_{(g)}}$
- D$SO_{3_{(aq)}}^{2-}$
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