Question

Contact process is used for the manufacture of sulphuric acid. Which of the following statement(s) is correct for this process?

• A. $V_{2}O_{5}$ is used for catalytic oxidation of $SO_{2}$ to $SO_{3}$ .
• B. $SO_{3}$ is absorbed in concentrated sulphuric acid.
• C. $SO_{3}$ is directly absorbed in water.
• D. Both the statements, $V_{2}O_{5}$ is used for catalytic oxidation of $SO_{2}$ to $SO_{3}$ and $SO_{3}$ is absorbed in concentrated sulphuric acid are correct.

Answer 1

Answer: (D)

Contact process is used for the manufacture of sulphuric acid.
The steps are as follows:
Step 1: Make sulphur dioxide.
Step 2: Convert sulphur dioxide into sulphur trioxide (The reversible reaction at the heart of the process).
Step 3: Convert sulphur trioxide into concentrated sulphuric acid.