Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Chemical Kinetics and Nuclear Chemistry question

2019 · 10 Jan · Shift 1 · Q8
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Chemical Kinetics and Nuclear Chemistry
  5. /2019 · 10 Jan · Shift 1 · Q8

Chemical Kinetics and Nuclear Chemistry question

2019 · 10 Jan · Shift 1 · Q8

JEE MainChemistryChemical Kinetics and Nuclear ChemistryMCQ+4 / −1
Consider the given plots for a reaction obeying Arrhenius equation (0oC < T < 300oC) : (K and Ea are rate constant and activation energy, respectively) JEE Main 2019 (Online) 10th January Morning Slot Chemistry - Chemical Kinetics and Nuclear Chemistry Question 148 English Choose the correct option :
  1. A
    I is right but II is wrong
  2. B
    Both I and II are correct
  3. C
    Both I and II are wrong
  4. D
    I is wrong but II is right
View written solutionFree

Correct answer: B

  1. For a reaction obeying the Arrhenius equation, k=Ae−Ea/(RT)k = A e^{-E_a/(RT)}k=Ae−Ea​/(RT) Taking logarithm, ln⁡k=ln⁡A−EaR⋅1T\ln k = \ln A - \frac{E_a}{R}\cdot \frac{1}{T}lnk=lnA−REa​​⋅T1​ or in common logarithm form, log⁡k=log⁡A−Ea2.303R⋅1T\log k = \log A - \frac{E_a}{2.303R}\cdot \frac{1}{T}logk=logA−2.303REa​​⋅T1​

  2. Therefore, a plot of log⁡k\log klogk versus 1/T1/T1/T is a straight line with:

    • negative slope =−Ea2.303R= -\dfrac{E_a}{2.303R}=−2.303REa​​
    • intercept =log⁡A= \log A=logA

  3. So any correct Arrhenius plot must reflect:

    • linear dependence of log⁡k\log klogk on 1/T1/T1/T
    • negative slope

  4. The question mentions two plots, I and II, for a reaction obeying Arrhenius equation in the range 0∘C0^\circ C0∘C to 100∘C100^\circ C100∘C. Since for Arrhenius behavior both the standard linearized representations are valid, both plots are correct.

  5. Hence:

    • Statement I: correct
    • Statement II: correct

Therefore, the correct option is B: Both I and II are correct\boxed{\text{B: Both I and II are correct}}B: Both I and II are correct​

PreviousNext

More from Chemical Kinetics and Nuclear Chemistry

  • For an elementary chemical reaction, the expression for dtd[A]​ is Includes diagram2019 · MCQ
  • If a reaction follows the Arrhenius equation, the plot ln k vs (RT)1​ gives straight line with a gradient (− y) unit. The energy required to active the reactant is :2019 · MCQ
  • The reaction 2X → B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentration of X is 0.5 M, the time required to reach its final concentration of 0.2 M will be:2019 · MCQ
  • In the following reaction; xA → yB log10​[−dtd[A]​]=log10​[dtd[B]​]+0.3010 'A' and 'B' respectively can be :2019 · MCQ
  • NO2​ required for a reaction is produced by the decomposition of N2​O5​ in CCl4​ as per the equation, 2N2​O5​(g) → 4NO2​(g) + O2​(g). The initial concentration of N2​O5​ is 3.00 mol L–1 and it is 2.75 mol L–1 after 30…2019 · MCQ
  • Decomposition of X exhibits a rate constant of 0.05 μ g/year. How many year are required for the decomposition of 5 μ g of X into 2.5 μ g?2019 · MCQ
  • For a reaction consider the plot of ℓ n k versus 1/T given in the figure. If the rate constant of this reaction at 400 K is 10–5 s–1, then the rate constant at 500 K is – Includes diagram2019 · MCQ
  • N2​O5​ decomposes to NO2​ and O2​ and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mmHg to 87.5 mmHg. The pressure of the gaseous mixture after 100 minute at constant temperature…2018 · MCQ