Name the gas which has the smell of burning sulphur.

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Solution

Sulphur dioxide (SO₂) is a colorless gas with a suffocating smell of burning Sulphur (S).
Sulphur dioxide is formed as follows by the reaction of Sodium sulphite (Na₂SO₃) and Sulphuric acid (H₂SO₄) to form Sulphur dioxide (SO₂) along with Sodium sulphate (Na₂SO₄) and water (H₂O)
${Na}_{2} {SO}_{3} (s) + H_{2} {SO}_{4} (aq) \to {SO}_{2} (g) + {Na}_{2} {SO}_{4} (aq) + H_{2} O (l) (Sodium sulphite) (Sulphuric acid) (Sulphur dioxide) (Sodium sulphate) (Water)$

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