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NEET Chemistry NEET PYQ-Chemical Kinetics

  • question_answer
    If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by-           [NEET 2019]

    A) t = 4.606/k

    B) t = 2.303/k

    C) t = 0.693/k

    D) t = 6.909/k

    Correct Answer: A

    Solution :

    [a] Chemical kinetics
                \[t=\frac{2.3}{K}\log \frac{a}{a-x}\]
                \[=\frac{2.3}{k}\log \frac{1.0}{1}\]
                \[\frac{2.303\times 2}{k}\]
                \[{{t}_{99%}}=\frac{6.606}{k}4.606/k\]


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