1 Answer

1. 

   Best Answer

   Exampix Verified

   2022-08-21T09:31:28+00:00Added an answer on August 21, 2022 at 9:31 am

   Solution

   The correct answer is Sulphurous acid.

   Explanation:

   When sulphur dioxide is dissolved in water it forms Sulphurous acid. The chemical formula of sulphur dioxide is SO₂.
   The chemical equation is shown below.

   • SO₂ +H₂O ⟶ H₂SO₃
   • Metallic oxides are formed when metals react with oxygen. Because they react with water to form bases, these metallic oxides are basic in nature.
   • Non-metals, on the other hand, react with oxygen to form non-metallic oxides, which differ from metallic oxides in that they are acidic. Non-metallic oxides also form acids when they react with water.
   • Sulphur is a non-metallic element, and sulphur dioxide (SO₂) is acidic. As a result, it reacts with water to produce sulphurous acid (H₂SO₃)
   • Properties of Sulphurous acid:
     • Sulphurous acid is a colourless liquid.
     • Sulphurous acid is a good reducing agent.
     • It is used as a mild bleaching agent for applications.
     • Sulphurous acid is unstable and has never been isolated in it its pure states.

   Additional Information

   • Sulphur Trioxide
     •  It reacts violently with water to form sulfuric acid with the release of heat.
   • Sulphur Pentaoxide
     • No direct reaction.
   • Sulphuric Acid
     • Water is less dense than sulfuric acid and will tend to float above the acid.
     • The reaction is best thought of as forming hydronium ions.

   Mistake Points

   •  Sulfur dioxide dissolves in water to give solutions that contain sulfurous acid H₂SO₃
   • 2 SO₂ (aq) + 2 H₂O (l) + O₂ (g) → 2 H₂SO₄(aq)  formation of the sulphuric acid from the sulphur dioxide.

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