Question

The substance added to SO₃ to manufacture H₂SO₄ by contact process is ______.

Options

• H₂O

• H₂SO₄

• H₂S₂O₇

• H₂S

Answer 1

The substance added to SO₃ to manufacture H₂SO₄ by contact process is `bbunderline(H_2SO_4)`.

Explanation:

In the Contact process, sulphur trioxide is absorbed in concentrated sulphuric acid to form oleum (H₂S₂O₇), which is then diluted with water to obtain sulphuric acid.

\[\ce{SO3 + H2SO4 -> H2S2O7}\]