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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Rate law and Rate Constant

  • 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                 [AIEEE 2004]

    A)                 7.5 minutes       

    B)                 15 minutes

    C)                 30 minutes         

    D)                 60 minutes

    Correct Answer: C

    Solution :

                    The concentration of the reactants decrease from 0.8 to 0.4 in 15 min i.e., \[{{T}_{1/2}}=15\]min, concentration from 0.1m to 0.025 will fall in 2 half lives so total time taken \[=2\times {{T}_{1/2}}=2\times 15=30\]min.


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