Question

Hot concentrated sulphuric acid is a moderately strong oxidising agent. Which of the following reactions does not show oxidising behaviour?
(a) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
(b) C + 2H2SO4 → CO2 + 2SO2 + 2H2O
(c) BaCl2 + H2SO4 → BaSO4 + 2HCl
(d) none of the above

Answer 1

Answer : option (c)

Explanation :- BaCl₂ + H₂SO₄ ⇔BaSO₄ + 2HCl
In this reaction, oxidation number of the atoms is not changed [ you can see oxidation number of Ba is +2 in both sides, also oxidation number of S +6 in both sides of reaction] . Hence, H₂SO₄ is not acting as oxidising agent.

Answer 2

The correct option is c.