Identify the correct statement from the following:

  1. Oxidation is removal of oxygen
  2. Oxidation and reduction takes place simultaneously
  3. Reduction is removal of hydrogen
  4. Chemical reaction is a physical change.


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1 Comment

  1. The correct answer is Sulphurous acid.


    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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