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Order of reaction from how the half-life changes with initial concentration or pressure

This type of question, asked 5 times: 25 Jun 2022, 25 Jul 2022, 26 Jul 2022, 24 Jan 2023, 28 Jan 2025. All 5 questions below, oldest first.

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  1. Question 1

    25 Jun 2022

    144
    At 45 K45\text{ }K, the half -life for the decomposition of a sample of a gaseous compound initially at 55.5kPa55.5kPa was 340 s340\text{ }s. When the pressure was 27.8kPa27.8kPa, the half life was found to be 170 s170\text{ }s. The order of the reaction is [integer answer]

  2. Question 2

    25 Jul 2022

    55
    The half-life for the decomposition of gaseous compound AA is 240 s240\text{ }s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half-life was found to be 4.0 min⁡4.0\text{ }\min. The order of the reaction is ____ (Nearest integer)

  3. Question 3

    26 Jul 2022

    58
    For a reaction A→2 B+CA \rightarrow 2\text{ }B + C the half -lives are 100 s100\text{ }s and 50 s50\text{ }s when the concentration of reactant AA is 0.5 and 1.0 mol L−11.0\text{ }mol{\text{ }L}^{- 1} respectively. The order of the reaction is ____\_\_\_\_. (Nearest Integer)

  4. Question 4

    24 Jan 2023

    123
    A student has studied the decomposition of a gas AB3AB_{3} at 25∘C25^{\circ}C. He obtained the following data.
    pp (mmHg)50100200400
    Relative t1/2t_{1/2} (s)4210.5
    The order of the reaction is

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  5. Question 5

    28 Jan 2025

    32
    For a given reaction R→P,t1/2R \rightarrow P,t_{1/2} is related to [A]0\lbrack A\rbrack_{0} as given in table :
    [A]0/molL−1\lbrack A\rbrack_{0}/molL^{- 1}t1/2/mint_{1/2}/min
    0.100200
    0.025100
    Given : log2=0.30log2 = 0.30 Which of the following is true? (A) The order of the reaction is 12\frac{1}{2}. (B) If [A]0\lbrack A\rbrack_{0} is 1 M , then t1/2t_{1/2} is 20010 min⁡200\sqrt{10}\text{ }\min (C) The order of the reaction changes to 1 if the concentration of reactant changes from 0.100 M to 0.500 M . (D) t1/2t_{1/2} is 800 min for [A]0=1.6M\lbrack A\rbrack_{0}= 1.6M Choose the correct answer from the options given below :

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