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

  • question_answer
    If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is

    A) 16g                              

    B) 2g  

    C) 32g                              

    D) 8g

    Correct Answer: D

    Solution :

    [d] \[{{t}_{1/2}}=5\] years, T= 15 years hence total number of half life periods \[=\frac{15}{5}=3\] \[\therefore \text{ }Amount\text{ }left=\frac{64}{{{(2)}^{3}}}=8g\]


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