NEET Sample Paper NEET Sample Test Paper-50

  • question_answer 61) At 300 K the half life of a sample of a gaseous compound initially at 1 atm is 100 sec. When the pressure is 0.5 atm the half life is 50 sec. The order of reaction is-

    A) 0                                 

    B) 1

    C) 2                                 

    D) 3

    Correct Answer: A

    Solution :

    \[\frac{{{({{t}_{1/2}})}_{1}}}{{{({{t}_{1/2}})}_{2}}}\,\,=\,\,{{\left( \frac{{{a}_{2}}}{{{a}_{1}}} \right)}^{n-1}}\] \[\frac{100}{50}\,\,=\,\,{{\left( \frac{0.5}{1} \right)}^{n-1}}\] \[2={{\left( \frac{1}{2} \right)}^{n-1}}\] \[\therefore \,\,\text{ }n\,\,=\,\,0\]

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