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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Mock Test - Chemical Kinetics

  • question_answer
    In a first-order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

    A) 60 minutes        

    B) 15 minutes

    C) 7.5 minutes       

    D) 30 minutes

    Correct Answer: D

    Solution :

    [d] \[{{t}_{1/2}}=15\operatorname{minute}\] \[\therefore t=\frac{2.303\times 15}{0.693}\log \frac{0.1}{0.025}=30\min \]


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