• # question_answer 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) 1C) 2                                 D) 3

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