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Question

When H2O2 is oxidised by a suitable oxidant, the product is 
  1. O2
  2. HO2
  3. OH
  4. O2


Solution

The correct option is D O2
Oxidation of H2O2:
H2O2 +[O]oxidationH2O + O2
Theory :
Decomposition:
Pure H2O2 is an unstable liquid and decomposes into water and O2 either upon standing or upon heating.
2H2O22H2O+O2;H=196.0 kJ mol1
Oxidising nature:
It is a powerful oxidising agent. It acts as an oxidising agent in neutral, acidic or in alkaline medium.
2KI+H2O2[In neutral medium]2KOH+I2
2FeSO4+H2SO4+H2O2[In acidic medium]Fe2(SO4)3+2H2O
MnSO4+H2O2+2NaOH[In alkaline medium]MnO2+Na2SO4+2H2O
Reducing nature:
Likely to take up oxygen from strong oxidising agents. Acts as a reducing agent.
H2O2+OFrom oxidising agentH2O+O2
Reacts as a reducing agent in acidic, basic or even in neutral medium.
In acidic medium, H2O22H++O2+2e
In alkaline medium, H2O2+2OH2H2O+O2+2e
2MnO4+6H++5H2O2[In acidic medium]2Mn2++8H2O+5O2
2MnO4+3H2O2[In alkaline medium]2MnO2+3O2+2H2O+2OH
 

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