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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Mock Test - Some Basic Concepts of Chemistry

  • question_answer
    A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \[C{{O}_{2}}\] The empirical formula of the hydrocarbon is

    A) \[{{C}_{2}}{{H}_{4}}\]          

    B) \[{{C}_{3}}{{H}_{4}}\]

    C) \[{{C}_{6}}{{H}_{5}}\]          

    D) \[{{C}_{7}}{{H}_{8}}\]

    Correct Answer: D

    Solution :

    18 g \[{{H}_{2}}O\]contains 2 g H. \[\therefore \] 0.72 g \[{{H}_{2}}O\]contains 0.08 g H 44 g \[C{{O}_{2}}\]contains 12 g C. \[\therefore \] 3.08 g \[C{{O}_{2}}\]contains 0.84 g C.
    Elements Wt. Wt./at. mass Simple Ratio Simple Whole ratio
    C 0.84 0.84/12 0.07 7
    H 0.08 0.08/1 0.08 8
    \[\therefore \] Empirical formula = \[{{C}_{7}}{{H}_{8}}\]


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