Test: Energy of Activation - NEET MCQ

In the upper atmosphere, form ation of H₂O₂ takes place as

H₂O+O → 2OH → H₂0₂

ΔH⁰ = 72.0 Kj mol^-1 ; E_a = 77.0 kJ mol^-1

E_a for the bim olecular recombination of two OH radicals to form H₂O and O is

How much rate is affected in the presence of catalyst at 300 K?

For a reaction,

A → Product

t₅₀  = 100 min at temprature T₁

and t₅₀ = 80 min at temprature T₂

Thus, 

Rate constant (k) of a reaction has least value at

Two reactions with different activation energies have the same rate at room temperature. Which statement correctly describes the rates of these two reactions at the same higher temperature?

The activation energy of the reaction at a given temperature is found to (2.303 RT) J mol^-1. The ratio of rate constant to the Arrhenius factor is

From the given figure, select the correct statement about activation energy.

Activation energy of

The rate of a chemical reaction doubles for every 10°C rise of temperature. If the tem perature is raised by 50°C, the rate of the reaction increases by about

[AIEEE 2011]

A reactant A forms two products B and C as given

A  B, Activation energy E_a1

A  C, Activation energy E_a2

if E_a2 = 2E_a1, then k₁ and K₂ are related as 

[AIEEE 2011]

Direction (Q. No. 14) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

  Rate constant {k) of a reaction is given by

Match the given property in Column I with its related value in Column II and select answer from codes given:

Direction (Q. Nos. 15-18)This section contains 2 paragraphs, which describing theory, experiments, data, etc. Four questions related to the paragraphs have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage I

For the displacement reaction,

[Co(NH₃)₅Cl]²⁺ (aq) + H₂O (l) → [Co(NH₃)₅H₂O]³⁺ + Cl^- (aq)

The rate constant is given by

Q. 

Rate constant at 25°C is 

Passage I

For the displacement reaction,

[Co(NH₃)₅Cl]²⁺ (aq) + H₂O (l) → [Co(NH₃)₅H₂O]³⁺ + Cl^- (aq)

The rate constant is given by

Q. 

Energy of activation for this reaction is

Passage II

For the opposing reaction,

E_a (forward reaction) = 100 kJ mol^-1

Pre-exponential factor A = 1.0 x 10¹⁰ M^-1s^-1

Q. 

The value of k₁ and k₂ at 700K respectively are

Passage II

For the opposing reaction,

E_a (forward reaction) = 100 kJ mol^-1

Pre-exponential factor A = 1.0 x 10¹⁰ M^-1s^-1

Q. 

The rate constant (k₁) for the forward reaction at 1000 K is

Direction (Q. Nos. 19-21) This section contains 3 questions. When worked out will result in one integer from 0 to 9 (both inclusive).

At room temperature (27°C) milk turns sour in about 64 h. In a refrigerator at -3°C, milk can be stored x times as long before it sours. The activation energy of the reaction that causes the souring of milk is 11.231 kcal mol-1.
What is the value of x?

The Arrhenius equations for the rate constant of decomposition of methyi nitrite and ethyl nitrite are

Find the temperature (in °C), at which rate contants are equal.

For the following sequence of reactions

Thus, observed E_a is .....kJ mol^-1.

This section contains 2 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Select the correct statement(s) about collision theory of reaction rates.

Consider the endothermic reaction,  X→Y

Heat o f reaction = ΔH with E_f = activation energy of the forw ard reaction.
E_b = activation energy of the backward reaction.
Then