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Which of the following is produced third in the contact process?

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in Chemistry – Class 12 by (188k points)
Which of the following is produced third in the contact process?

(a) Sulfur dioxide

(b) Sulfur trioxide

(c) Pyrosulfuric acid

(d) Sulfuric acid

The question was asked in unit test.

Question is from P-Block Elements in chapter P-Block Elements of Chemistry – Class 12

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Correct answer is (c) Pyrosulfuric acid

The explanation: In the first step, sulfur is converted to sulfur dioxide. Second step involves reacting it with more oxygen to form sulfur trioxide. Instead of reacting sulfur trioxide with water to form sulfuric acid directly, an alternative, safer method is utilized to dissolve sulfur trioxide gas in sulfuric acid to form oleum, also known as pyrosulfuric acid.

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