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JEE Main & Advanced Sample Paper JEE Main Sample Paper-30

  • 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 minutes                 

    B)  5 minutes

    C)  7.5 minutes                

    D)  15 minutes

    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 \[A=20\], so \[\therefore 2\times {{t}_{1/2}}=10\]minutes \[{{t}_{1/2}}=5\]minutes


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