2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main - Mock Test - 26

  • question_answer
    0.765 g of an acid gives 0.535 g of \[C{{O}_{2}}\]and 0.138 g of \[{{H}_{2}}O\]. Then the ratio of the percentage of carbon and hydrogen is

    A) 19 : 2   

    B) 18 : 11

    C) 20: 17  

    D) 1:7

    Correct Answer: A

    Solution :

    [a] : Mass of the organic compound (w) = 0.765 g Mass of the carbon dioxide formed (x) = 0.535 g   Mass of the water formed (y) = 0.138 g           Percentage of hydrogen\[=\frac{2}{18}\times \frac{y}{w}\times 100\] \[=\frac{2}{18}\times \frac{0.138}{0.765}\times 100=2%\] Percentage of carbon\[=\frac{12}{44}\times \frac{x}{w}\times 100\] \[=\frac{12}{44}\times \frac{0.535}{0.765}\times 100=19%\] So, the ratio of C:H= 19:2


You need to login to perform this action.
You will be redirected in 3 sec spinner