JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques Question Bank Chemical analysis of organic compounds

  • question_answer 0.24 g of an organic compound gave 0.22 g \[C{{O}_{2}}\] on complete combustion. If it contains 1.66 % hydrogen, then the percentage of C and O will be [MP PET 1986]

    A) 12.5 and 36.6

    B) 25 and 75

    C) 25 and 36.6

    D) 25 and 80

    Correct Answer: B

    Solution :

    % of C = \[\frac{12}{44}\times \frac{\text{Mass of }C{{O}_{2}}}{\text{Mass of substance}}\times 100\] = \[\frac{12\times 0.22}{44\times 0.24}\times 100\]= 25; C = 25, H = 1.66 Total = 26.6 = 100 - 26.6 = 73.4.


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