English

Choose the most correct option. For an endothermic reaction, X ⇌ Y. If Ef is the activation energy of the forward reaction and Er that for the reverse reaction, which of the following is correct? - Chemistry

Advertisements
Advertisements

Question

Choose the most correct option.

For an endothermic reaction, X ⇌ Y. If Ef is the activation energy of the forward reaction and Er that for the reverse reaction, which of the following is correct?

Options

  • Ef = Er

  • Ef < Er

  • Ef > Er

  • ∆H = Ef - Er is negative

MCQ

Solution

Ef > Er

shaalaa.com
Rate of Reaction and Reactant Concentration
  Is there an error in this question or solution?
Chapter 6: Chemical Kinetics - Exercises [Page 136]

APPEARS IN

Balbharati Chemistry [English] 12 Standard HSC
Chapter 6 Chemical Kinetics
Exercises | Q 1. x. | Page 136

RELATED QUESTIONS

Choose the most correct option.

The order of the reaction for which the units of the rate constant are mol dm-3 s-1 is _______.


Choose the most correct option.

The rate constant for the reaction \[\ce{2N2O5_{(g)} -> 2N2O4_{(g)} + O2_{(g)}}\] is `4.98 xx 10^-4 "s"^-1`. The order of reaction is _____________.


The time required for 90% completion of a certain first-order reaction is t. The time required for 99.9% completion will be _________.


What is the half life of a first order reaction if time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 h?


Choose the most correct option.

Rate law for the reaction, \[\ce{2NO + Cl2 -> 2NOCl}\] is rate = k[NO2]2[Cl2]. Thus of k would increase with _____________.


Answer the following in one or two sentences.

For the reaction, \[\ce{CH3Br_{(aq)} + OH^{-}_{(aq)} -> CH3OH^{\ominus}_{(aq)} + Br^{\ominus}_{(aq)}}\], rate law is rate = \[\ce{k[CH3Br][OH^\ominus]}\]

How does reaction rate changes if \[\ce{[OH^\ominus]}\] is decreased by a factor of 5?


Answer the following in one or two sentences.

For the reaction,

\[\ce{CH3Br_{(aq)} + OH^-_{ (aq)} -> CH3OH^-_{ (aq)} + Br^-_{ (aq)}}\], rate law is rate = k`["CH"_3"Br"]["OH"^-]`

What is the change in rate if concentrations of both reactants are doubled?


The rate law relates to the rate of a chemical reaction in terms of _______.


Order of reaction for which unit of rate constant is mol dm–3 s–1 is _______.


For the reaction \[\ce{2NO_{(g)} + 2H_{2(g)} -> N_{2(g)} + 2H2O_{(g)}}\],

The rate law is, rate = k[NO]2 [H2].

What is the overall order of reaction?


For the non-stoichiometric reaction

\[\ce{2A + B -> C + D}\], the following kinetic data were obtained in three separate experiments, all at 298 K.

Initial concentration
(A)
Initial concentration
(B)
Initial rate of formation of C
(mol dm−3 s−1)
0.1 M 0.1 M 1.2 × 10−3
0.1 M 0.2 M 1.2 × 10−3
0.2 M 0.1 M 2.4 × 10−3

The rate law for the formation of C is:


For a chemical reaction rate law is, rate = k[A]2[B]. If [A] is doubled at constant [B], the rate of reaction ______.


Consider the reaction \[\ce{2A + 2B -> C + 2D}\], if concentration of A is doubled at constant [B], rate increases by a factor 4. If concentration B is doubled at constant [A] the rate is doubled. Rate law of the reaction is ____________.


The rate law for the reaction \[\ce{2NO_{(g)} + O2_{(g)} -> 2NO2_{(g)}}\] is rate = k[NO]2 [O2] , then which among the following statement is correct?


In the reaction \[\ce{A + B2 -> AB + B}\], the rate of reaction is directly proportional to the concentration of A and independent on the concentration of B2. What is the rate law expression?


The reaction \[\ce{A + B -> P}\], is second order in A and first order in B. What is the rate law for the reaction?


In the reaction, \[\ce{N2 + 3H2 -> 2NH3}\], the rate of disappearance of H2 is 0.02 Mis. The rate of appearance of NH3 is ______.


What is the order of reaction for decomposition of gaseous acetaldehyde?


In the reaction \[\ce{2SO_{2_{(g)}} O_{2_{(g)}} -> 2SO_{3_{(g)}}}\], the rate of disappearance of SO2 is 1.28 × 10-5 M/s. What is the rate of appearance of SO3?


For the reaction \[\ce{2A + B -> 3C + D}\], which among the following is NOT the correct rate law expression?


For the reaction \[\ce{4NH3 + 5O2 -> 4NO + 6H2O}\], the rate of disappearance of NH3 is 3.6 × 10-3 M/s. What is the rate of formation of water?


Which of the following statement is not true for a reaction having rate law r = k[H2][I2]?


Write the rate law for the following reaction:

A reaction that is zero order in A and second order in B.


For a chemical reaction A → 7 products, the rate of reaction doubles when the concentration of A is increased by a factor 4. The order of the reaction is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×