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NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    For a chemical reaction \[{{t}_{1/2}}\] is 2.5 hours at room temperature. How much of the reactant will be left after 7.5 hours if initial weight of reactant was 160g?

    A) 10 g                 

    B) 40 g  

    C) 80 g                 

    D) 20 g

    Correct Answer: D

    Solution :

    [d] Using the relation \[\left[ A \right]={{\left[ A \right]}_{0}}{{(1/2)}^{n}}\][n =number of half-lives \[T=n\times {{t}_{1/2}}\] Here, \[n=\frac{7.5}{2.5}=3\] \[\therefore [A]=160\times {{\left( \frac{1}{2} \right)}^{3}}=160\times \frac{1}{8}=20g\]


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