What is the oxidising agent in the following equation? 

HAsO2 (aq) + Sn2+ (aq) + H+ (aq) → As(s) + Sn4+ (aq) + H2O(l)

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  1. HAsO2 (aq)
  2. Sn2+ (aq)
  3. H+ (aq)
  4. Sn4+ (aq) 

Answer (Detailed Solution Below)

Option 1 : HAsO2 (aq)
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Detailed Solution

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The correct answer is HAsO2 (aq)

Key Points

The balanced chemical equation for the given reaction is:

HAsO2(aq) + 2Sn2+(aq) + 4H+(aq) → As(s) + 2Sn4+(aq) + 2H2O(l)

In this reaction, HAsO2 (aq) acts as an oxidizing agent and Sn2+ acts as a reducing agent.

Important PointsOxidizing agent:

  • An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. 
  • Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. 
  • Chlorine is used as the oxidizing agent for the purification of water.

Reducing agent:

  • A reducing agent, or reductant, loses electrons and is oxidized in a chemical reaction. 
  • Examples of reducing agents include the earth metals, formic acid, and sulfite compounds

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