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

  • question_answer
    About 0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon in hydrocarbon is:

    A) 75.8

    B) 80.0         

    C) 56.6

    D) 28.6

    Correct Answer: B

    Solution :

    [b] % of
    \[H=\frac{2}{18}\times \frac{\text{Weight}\,\text{of}\,{{H}_{2}}O}{\text{Weight}\,\text{of}\,\text{organic}\,\text{compound}\,}\times 100\]
    \[=\frac{2}{18}\times \frac{0.9}{0.5}\times 100=20%\]
    Since percentage of hydrogen is 20. Therefore, remaining is carbon, i.e., 80%.


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