JEE Main & Advanced Sample Paper JEE Main Sample Paper-11

  • question_answer
                                    Brown colour in \[HN{{O}_{3}}\] can be removed by

    A)  Adding Mg powder

    B)  Boiling the acid

    C)  Passing \[N{{H}_{3}}\] through acid

    D)  Passing air through warm acid

    Correct Answer: D

    Solution :

     Nitric acid decomposes to give \[N{{O}_{2}}\] which is brown. \[4HN{{O}_{3}}\to 4N{{O}_{2}}+2{{H}_{2}}O+{{O}_{2}}\] When air is passed through acid the reaction proceeds towards left hand hand side and brown colour diminishes.

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