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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    Hydrogen peroxide acts both as an oxidizing 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?

    A) \[MnO_{4}^{-}\]         

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

    C) \[SO_{3}^{2-}\]          

    D)        \[KI\]

    Correct Answer: A

    Solution :

    [a] \[{{H}_{2}}{{O}_{2}}\] acts as a reducing agent only in presence of strong oxidising agents (i.e., \[Mn{{O}_{4}}^{-}\]) 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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