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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Sample Paper Topic Test - Chemical Kinetics

  • question_answer
    Decomposition of A follows first order kinetics by the following equation.
    \[4A(g)\xrightarrow{{}}B(g)+2C(g)\]
    If initially, total pressure was 800 mm of Hg and after 10 minutes it is found to be 650 mm of Hg. What is half-life of A? (Assume only A is present initially).

    A) 10 mins

    B) 5 mins

    C) 7.5 mins

    D) 15 mins

    Correct Answer: B

    Solution :

      \[4A(g)\xrightarrow{{}}\] B(g)  + 2C(g)
    t = 0 800 \[-\] \[-\]
    t = 10 minutes, 800 - 4p p 2p
    800 - p = 650 \[\therefore \]      p = 150 Pressure of A = 200, so \[\therefore \]      \[2\times {{t}_{1/2}}=10\] minutes \[{{t}_{1/2}}=5\] minutes


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