KVPY Sample Paper KVPY Stream-SX Model Paper-7

  • question_answer
    'X' react with dil \[{{H}_{2}}S{{O}_{4}}\] to give ?Y? gas for a moment and then the reaction stows down due to the formation of 'Z'; X, Y & Z can be

    A) \[CuS{{O}_{4}},S{{O}_{2}},C{{u}_{2}}O\]

    B)  \[N{{a}_{2}}{{C}_{2}}{{O}_{4}},CO,C{{O}_{2}}\]

    C) \[PbC{{O}_{3}},C{{O}_{2}},PbS{{O}_{4}}\]

    D) \[CaC{{O}_{3}},C{{O}_{2}},CaS{{O}_{4}}\]

    Correct Answer: C

    Solution :

    \[PbC{{O}_{3}}+{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}PbS{{O}_{4}}+C{{O}_{2}}+{{H}_{2}}O\] \[PbS{{O}_{4}}\]forms a film around \[PbC{{O}_{3}}\]. Thus slowly reaction ceases


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