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Zero order reaction: rate constant, half-life and time from the integrated rate law

This type of question, asked 6 times: 3 May 2023 S2, 9 May 2023 S1, 10 May 2023 S1, 16 May 2023 S1, 21 Apr 2025 S2, 17 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    3 May 2023 S2

    54
    For a zero-order reaction A→A\rightarrow product. Conc. of A decreases from 0.8 mol dm−30.8\text{ mol dm}^{-3} to 0.2 mol dm−30.2\text{ mol dm}^{-3} in 6 minute. What is rate constant of the reaction?

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  2. Question 2

    9 May 2023 S1

    100
    Find the percentage of unreacted reactant for zero order reaction in 90 second having rate constant 1 mol dm−3 s−11\,\text{mol\,dm}^{-3}\,\text{s}^{-1}.

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  3. Question 3

    10 May 2023 S1

    55
    For a zero-order reaction, A⟶\text{A}\longrightarrow product, concentration of A decreases from 1.2 mol dm−31.2\,\text{mol dm}^{-3} to 0.4 mol dm−30.4\,\text{mol dm}^{-3} in 240 second. What is rate constant of the reaction?

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  4. Question 4

    16 May 2023 S1

    89
    A zero-order reaction has half life time of 0.2 minute. If initial concentration of reactant is 0.2 mol dm−30.2\,\text{mol dm}^{-3}. Find rate constant.

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  5. Question 5

    21 Apr 2025 S2

    94
    For a reaction, A⟶BA \longrightarrow B, rate equation is r=k[A]∘r = k\lbrack A\rbrack^{\circ}. If initial concentration of reactant is 'a'mol dm−3dm^{- 3} find half life time of reaction.

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  6. Question 6

    17 Apr 2026 S1

    27
    Half life of zero order reaction is 1 hour. If initial concentration of reactant is 2.0 mol L−1\mathrm{L^{-1}}, find the time required to decrease concentration from 0.50 to 0.25 mol L−1\mathrm{L^{-1}}

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