Manipal Medical Manipal Medical Solved Paper-2005

  • question_answer
    In which of these processes platinum is used as a catalyst?

    A)  Oxidation of ammonia to form\[HN{{O}_{3}}\]

    B)  Hardening of oils

    C)  Production of synthetic rubber

    D)  Synthesis of methanol

    Correct Answer: A

    Solution :

     Platinum acts as catalyst in the oxidation of ammonia to form nitric oxide. This reaction is used in the Ostwalds method of nitric acid preparation. \[4N{{H}_{3}}+5{{O}_{2}}\xrightarrow[750{}^\circ C]{Pt}4NO+6{{H}_{2}}O\] \[2NO+{{O}_{2}}\xrightarrow[{}]{{}}2N{{O}_{2}}\] \[4N{{O}_{2}}+{{O}_{2}}+2{{H}_{2}}\text{O}\xrightarrow[{}]{{}}4HN{{O}_{3}}\]


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