what evidence supports the clarification that H2Se 03 is an acid and how do i identify the positive ions present inthe aqueous solution

Question

I am a little confused by the word "clarification" in your question. What evidence do you have? Could you measure the pH of the solution? Would that tell you H^+ (positive ions) were present? What about electrical conductance of an aqueous solutin? Would that tell you it was ionized, at least somewhat?

it says that the solution conducts electricity and turns litmus paper red

Isn't that enough to tell you. Conductance means there are ions there. Litmus paper tells you it is acid and that means hydrogen ions are present.