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Chemical Kinetics

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Rate of a Chemical Reaction

Subtopic

Rate of a Chemical Reaction under Chemical Kinetics for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The branch of chemistry which deals with the study of reaction rates and their mechanisms is called:

    A.

    Thermodynamics

    B.

    Chemical Kinetics

    C.

    Electrochemistry

    D.

    Stoichiometry

  2. 2.

    In a reaction R→PR \rightarrow P, if the concentration of RR changes from 0.03M0.03\text{M} to 0.02M0.02\text{M} in 25 minutes25\text{ minutes}, the average rate in mol L−1min−1\text{mol L}^{-1} \text{min}^{-1} is:

    A.

    4×10−44 \times 10^{-4}

    B.

    8×10−48 \times 10^{-4}

    C.

    0.010.01

    D.

    2.5×10−32.5 \times 10^{-3}

  3. 3.

    When the concentration of reactants is expressed in atmospheres (atm), what is the unit for the average rate of reaction?

    A.

    atm−1s−1\text{atm}^{-1} \text{s}^{-1}

    B.

    atm s−1\text{atm s}^{-1}

    C.

    mol L−1s−1\text{mol L}^{-1} \text{s}^{-1}

    D.

    atm s\text{atm s}

Download the worksheet for Chemical Kinetics - Rate of a Chemical Reaction to practice offline. It includes additional chapter-level practice questions.

Factors Influencing Rate of a Reaction

Subtopic

Factors Influencing Rate of a Reaction under Chemical Kinetics for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is the correct Arrhenius equation?

    A.

    k=AeEa/RTk = A e^{E_a/RT}

    B.

    k=Ae−Ea/RTk = A e^{-E_a/RT}

    C.

    k=Aln⁡(−Ea/RT)k = A \ln(-E_a/RT)

    D.

    k=Eae−A/RTk = E_a e^{-A/RT}

  2. 2.

    The 'Orientation Factor' in collision theory is denoted by the letter:

    A.

    ZZ

    B.

    PP

    C.

    ff

    D.

    EE

  3. 3.

    For a first-order reaction, the units of the frequency factor AA in the Arrhenius equation are:

    A.

    mol L−1 s−1mol \, L^{-1} \, s^{-1}

    B.

    L mol−1 s−1L \, mol^{-1} \, s^{-1}

    C.

    s−1s^{-1}

    D.

    Unitless

Download the worksheet for Chemical Kinetics - Factors Influencing Rate of a Reaction to practice offline. It includes additional chapter-level practice questions.

Integrated Rate Equations (Zero and First Order)

Subtopic

Integrated Rate Equations (Zero and First Order) under Chemical Kinetics for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which order of reaction does the following unit of rate constant kk belong to: L mol−1 s−1L\ mol^{-1}\ s^{-1}?

    A.

    Zero

    B.

    First

    C.

    Second

    D.

    Third

  2. 2.

    What is the dimension of the rate constant kk for a first-order reaction?

    A.

    [M]1[L]−3[T]−1[M]^1 [L]^{-3} [T]^{-1}

    B.

    [T]−1[T]^{-1}

    C.

    [M]−1[L]3[T]−1[M]^{-1} [L]^3 [T]^{-1}

    D.

    [M]1[L]−3[M]^1 [L]^{-3}

  3. 3.

    The time required for 90% completion of a first-order reaction (t90%t_{90\%}) is approximately how many times the half-life (t1/2t_{1/2})?

    A.

    1.1 times

    B.

    2.2 times

    C.

    3.3 times

    D.

    4.4 times

Download the worksheet for Chemical Kinetics - Integrated Rate Equations (Zero and First Order) to practice offline. It includes additional chapter-level practice questions.

Temperature Dependence of the Rate of a Reaction (Arrhenius Equation)

Subtopic

Temperature Dependence of the Rate of a Reaction (Arrhenius Equation) under Chemical Kinetics for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The Arrhenius equation was proposed to explain the effect of temperature on the:

    A.

    Concentration of reactants

    B.

    Rate of reaction

    C.

    Order of reaction

    D.

    Molecularity of reaction

  2. 2.

    Which constant is used to calculate the value of EaE_a when two rate constants at two different temperatures are known?

    A.

    Planck's constant

    B.

    Gas constant (RR)

    C.

    Faraday's constant

    D.

    Avogadro's number

  3. 3.

    The energy barrier that reactants must overcome to form products is called:

    A.

    Enthalpy

    B.

    Entropy

    C.

    Activation energy

    D.

    Binding energy

Download the worksheet for Chemical Kinetics - Temperature Dependence of the Rate of a Reaction (Arrhenius Equation) to practice offline. It includes additional chapter-level practice questions.

Collision Theory of Chemical Reactions

Subtopic

Collision Theory of Chemical Reactions under Chemical Kinetics for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the primary factor that causes the rate to increase significantly with a small rise in temperature?

    A.

    Increase in mass

    B.

    Increase in the number of effective collisions

    C.

    Decrease in the volume of molecules

    D.

    Increase in the number of protons

  2. 2.

    How does the steric factor PP relate to the probability of an effective collision?

    A.

    PP is inversely proportional to probability

    B.

    PP represents the probability of proper orientation

    C.

    PP is always greater than 100

    D.

    PP is independent of the reaction mechanism

  3. 3.

    In collision theory, EaE_a stands for:

    A.

    Entropy

    B.

    Enthalpy

    C.

    Activation energy

    D.

    Atomic energy

Download the worksheet for Chemical Kinetics - Collision Theory of Chemical Reactions to practice offline. It includes additional chapter-level practice questions.

Chemical Kinetics - Class 12 Chemistry (CBSE) | Krit.club