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

2021 · 25 Jul · Shift 2 · Q20
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. /2021 · 25 Jul · Shift 2 · Q20

Chemical Kinetics and Nuclear Chemistry question

2021 · 25 Jul · Shift 2 · Q20

JEE MainChemistryChemical Kinetics and Nuclear ChemistryNumerical+4 / −1
For a chemical reaction A →\to→ B, it was found that concentration of B is increased by 0.2 mol L −-− in 30 min. The average rate of the reaction is ‾\underline{\hspace{2cm}}​×\times× 10 −-− 1 mol L −-− 1 h −-− 1. (in nearest integer)
Numerical answer
View written solutionFree

Correct answer: 4

  1. For the reaction A→BA \to BA→B the stoichiometric coefficients of AAA and BBB are both 1.

  2. The average rate of reaction can be written in terms of product formation as Average rate=Δ[B]Δt\text{Average rate} = \frac{\Delta [B]}{\Delta t}Average rate=ΔtΔ[B]​

  3. Given:

    • Increase in concentration of BBB: Δ[B]=0.2 mol L−1\Delta [B] = 0.2\,\text{mol L}^{-1}Δ[B]=0.2mol L−1
    • Time interval: Δt=30 min=0.5 h\Delta t = 30\,\text{min} = 0.5\,\text{h}Δt=30min=0.5h

  4. Therefore, Average rate=0.20.5=0.4 mol L−1h−1\text{Average rate} = \frac{0.2}{0.5} = 0.4\,\text{mol L}^{-1}\text{h}^{-1}Average rate=0.50.2​=0.4mol L−1h−1

  5. The question asks to write this as ‾×10−1 mol L−1h−1\underline{\hspace{2cm}} \times 10^{-1}\,\text{mol L}^{-1}\text{h}^{-1}​×10−1mol L−1h−1

    Since 0.4=4×10−10.4 = 4 \times 10^{-1}0.4=4×10−1

  6. Hence, the required integer is 4\boxed{4}4​

PreviousNext

More from Chemical Kinetics and Nuclear Chemistry

  • The following data was obtained for chemical reaction given below at 975 K. 2NO(g) + 2H2​(g) → N2​(g) + 2H2​O(g) The order of the reaction with respect to NO is ​. [Integer answer] Includes diagram2021 · Numerical
  • If the activation energy of a reaction is 80.9 kJ mol − 1, the fraction of molecules at 700 K, having enough energy to react to form products is e − x. The value of x is ​. (Rounded off to the nearest integer)…2021 · Numerical
  • The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2K2​Cr2​O7​+8H2​SO4​+3C2​H6​O→2Cr2​(SO4​)3​+3C2​H4​O2​+2K2​SO4​+11H2​O…2021 · Numerical
  • The first order rate constant for the decomposition of CaCO3​ at 700 K is 6.36 × 10 − 3s − 1 and activation energy is 209 kJ mol − 1. Its rate constant (in s − 1) at 600 K is x × 10 − 6. The value of x is ​…2021 · Numerical
  • For a reaction of order n, the unit of the rate constant is :2021 · MCQ
  • For the first order reaction A → 2B, 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is ​ min. (Round off to the nearest integer). [Use : ln 2 = 0.69, ln 10 = 2.3]…2021 · Numerical
  • For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is ​. (Integer answer)2021 · Numerical
  • According to the following figure, the magnitude of the enthalpy change of the reaction A + B → M + N in kJ mol − is equal to ​. (Integer answer) Includes diagram2021 · Numerical