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JEE Main & Advanced JEE Main Paper (Held On 12 April 2014)

  • question_answer
    Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases \[{{H}_{2}}{{O}_{2}}\]acts as a reducing agent in acid medium?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )

    A) \[MnO_{4}^{-}\]             

    B) \[C{{r}_{2}}O_{7}^{2-}\]

    C) \[SO_{3}^{2-}\]                

    D) KI

    Correct Answer: A

    Solution :

                    \[{{H}_{2}}{{O}_{2}}\]acts as a reducing agent only in presence of strong oxidising agents (i.e., \[MnO_{4}^{-}\]) in acidic as well as alkaline medium. \[2KMn{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}+5{{H}_{2}}{{O}_{2}}\xrightarrow[{}]{{}}\] \[{{K}_{2}}S{{O}_{4}}+2MnS{{O}_{4}}+8{{H}_{2}}O+5{{O}_{2}}\]                


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