Question

What is the ratio of volumes of gases involved in the preparation of sulphur trioxide from sulphur dioxide and dioxygen respectively under similar conditions of temperature and pressure?

Options

• 1 : 3 : 1

• 2 : 1 : 2

• 1 : 1 : 1

• 1 : 2 : 1

Answer 1

2 : 1 : 2

Explanation:

\[\ce{2SO2 + O2 ->[High T][Pressure] 2SO3}\]

Ratio: 2 : 1 : 2