Addition of H₂SO₄ to BaO₂ produces :

Solution

Chemistry ma’am · 4 steps

Barium peroxide is a salt of H₂O₂, so a stronger acid hands the peroxide back.

1. Spot the ion. BaO₂ contains the peroxide ion O₂²⁻, which is the conjugate base of the weak acid H₂O₂. Oxygen here is in the -1 state.
2. Acid displaces it. Dilute H₂SO₄ is a much stronger acid, so it protonates the peroxide ion to give H₂O₂. No oxidation or reduction happens, so no O₂ or H₂ is formed.

   BaO₂.8H₂O + H₂SO₄ → BaSO₄ v + H₂O₂ + 8H₂O

3. Why it works. BaSO₄ is insoluble and settles out as a white precipitate. Filtering it off leaves a dilute solution of H₂O₂, which is the laboratory method of preparing hydrogen peroxide.
4. So. The products are BaSO₄ and H₂O₂, which is option (d).

The idea to keep. A metal peroxide plus dilute acid is an acid-base swap: the acid takes the metal and gives back H₂O₂. Choose BaO₂ with H₂SO₄ so the side product precipitates.

Answer from the NTA final answer key. Solution by PrepWiser.