Question

What is the first step involved in forming sulphuric acid through contact process?

(a) Conversion of SO2 to SO3

(b) Burning of Sulphur or roasting sulphide ores to generate SO2

(c) Absorption of SO3 in sulphuric acid

(d) Purifying SO3

This question was posed to me in an interview for job.

Origin of the question is P-Block Elements topic in chapter P-Block Elements of Chemistry – Class 12

Answer 1

Correct answer is (b) Burning of Sulphur or roasting sulphide ores to generate SO2

The best explanation: The first step involved in forming sulphuric acid through contact process is Burning of Sulphur or roasting sulphides ores to generate SO2. Sulphur dioxide is purified by removing dust and arsenic impurities.