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

  • question_answer
    A radioactive isotope having a half - life period of 3 days was received after 12 days. If 3g of the isotope is left in the container, what would be the initial mass of the isotope?

    A) 12g                  

    B) 36g  

    C) 48g                  

    D) 24g

    Correct Answer: C

    Solution :

    [c] Given \[{{t}_{1/2}}=3\] Total time T =12 No. of half lives \[\left( n \right)=\frac{12}{3}=4\] \[{{\left( \frac{1}{2} \right)}^{n}}=\frac{N}{{{N}_{o}}}\therefore {{\left( \frac{1}{2} \right)}^{4}}=\frac{3}{N}\] \[\frac{3}{N}=\frac{1}{16}\] N=48 g


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