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AMU Medical AMU Solved Paper-2015

  • question_answer
    Consider a first order decomposition process \[{{A}_{3}}\xrightarrow{{}}\frac{3}{2}{{A}_{2}}\]A plot of concentration of \[{{A}_{3}}\] and \[{{A}_{2}}\] versus time is shown below. At time \[{{t}_{A}}\], percentage of reactant decomposed is

    A)  75%                                      

    B)  50%

    C)  40%                                      

    D)  30%

    Correct Answer: C

    Solution :

                    Let initial concentration is C of \[{{A}_{3}}\], then after sometime let it decrease by D, so \[{{A}_{2}}s\]concentration increases by \[\frac{3}{2}\times D\] due to stoichiometric ratios, when equal,                                 \[C-D=\left( \frac{3}{2} \right)D=\left( \frac{2}{5} \right)C\] Hence, concentration of \[{{A}_{3}}\] reduced by \[\frac{2}{5}\] th or 40%.


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