Which gas is used in the manufacture of sulfuric acid via the Contact process?

Practice MCQ for SSC, UPSC, RRB Exams

A. Sulfur dioxide A.
B. Hydrogen sulfide B.
C. Nitrogen dioxide C.
D. Carbon monoxide D.

Correct Answer: A সঠিক উত্তর: A

Explanation ব্যাখ্যা

In the manufacture of sulfuric acid via the Contact process, sulfur dioxide (SO₂) is the key gas used in the production of sulfuric acid. This gas is initially produced by burning sulfur or sulfur-containing ores in air. SO₂ is then further reacted with oxygen (O₂) in the presence of a catalyst (usually vanadium pentoxide, V₂O₅) to form sulfur trioxide (SO₃). This SO₃ is subsequently absorbed in concentrated sulfuric acid to form oleum, which is then diluted with water to produce the desired sulfuric acid.

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