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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Catalyst and Catalysis

  • question_answer
    Platinised asbestos helps in the formation of \[S{{O}_{3}}\] form \[S{{O}_{2}}\] and \[{{O}_{2}}\]. But, if even a small amount of \[A{{s}_{2}}{{O}_{3}}\] is present the platinised asbestos does not help in the formation of \[S{{O}_{3}}\]. \[A{{s}_{2}}{{O}_{3}}\] acts here as         [MP PMT 1997]

    A)                 A positive catalyst           

    B)                 A negative catalyst

    C)                 An auto catalyst               

    D)                 A poison

    Correct Answer: D

    Solution :

      \[2S{{O}_{2}}+{{O}_{2}}\underset{A{{s}_{2}}{{S}_{3}}(\text{Poison})}{\mathop{\xrightarrow{\text{Platinised}\,\text{asbestos(catalyst})}}}\,2S{{O}_{3}}\]


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