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

  • question_answer
    For a first order reaction \[A\to B\] the reaction rate at reactant concentration of 0.01 M is found to be\[2.0\times {{10}^{-5}}mol\text{ }{{L}^{-1}}\text{ }{{s}^{-1}}\]. The half-life period of the reaction is

    A) 30 s                 

    B) 220 s

    C) 300 s                

    D) 347 s

    Correct Answer: D

    Solution :

    [d] Given \[\left[ A \right]=0.01\text{ }M\] Rate \[=2.0\times {{10}^{-5}}mol\text{ }{{L}^{-1}}{{s}^{-1}}\] For a first order reaction Rate \[=k\left[ A \right]\] \[k=\frac{2.0\times {{10}^{-5}}}{[0.01]}=2\times {{10}^{-3}}\] \[{{t}_{1/2}}=\frac{0.693}{2\times {{10}^{-3}}}=347\sec \]


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