How are SO 2 Cl 2 .SO 3 and SO 2 obtained from sulphuric ac…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Subjective Type

Published on: August 13, 2026

How are SO 2 Cl 2 .SO 3 and SO 2 obtained from sulphuric acid ?

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SO 2 Cl 2 is formed from H 2 SO 4 by treating with excess of phosphorus pentachloride.

H 2 SO 4 + 2PCl 5 ⎯→ SO 2 Cl 2 + 2HCl + 2POCl 3

SO 3 is obtained from sulphuric acid by dehydration with phosphorus pentachloride.

2H 2 SO 4 + P 4 O 10 ⎯→ 4HPO 3 + 2SO 3

SO 2 is obtained from conc. H 2 SO 4 , when heated with copper metal.

2H 2 SO 4 (conc.) + Cu ⎯→ CUSO 4 + 2H 2 O + 2SO 2

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