Question

The oxidising agent in the equation, \[\ce{S + 2HSO4 -> 3SO2 + 2H2O}\] is ______.

Options

• Sulphur

• Sulphuric acid

• Sulphur dioxide

• Water

Answer 1

The oxidising agent in the equation, \[\ce{S + 2HSO4 -> 3SO2 + 2H2O}\] is sulphuric acid.

Explanation:

In this reaction, elemental sulphur S) has an oxidation state of 0 and is oxidised to +4 in SO₂, meaning it loses electrons. Concurrently, the sulphur atom in sulphuric acid (H₂SO₄) is reduced from an oxidation state of +6 to +4 in SO₂. Because sulphuric acid gains these electrons and oxidises elemental sulphur, it acts as the oxidising agent.