Activation energy of any chemical reaction can be calculated if one knows the value of

1. Probability of collision.
2. Orientation of reactant molecules during collision.
3. Rate constant at two different temperatures.
4. Rate constant at standard temperature.

Subtopic:  Arrhenius Equation |
69%
From NCERT
NEET - 2024
Hints

Which plot of In k vs $$\frac{\text{I}}{\text{T}}$$ is consistent with Arrhenius equation?
 1 2 3 4

Subtopic:  Arrhenius Equation |
63%
From NCERT
NEET - 2024
Hints

The rate of a reaction quadruples when temperature changes from 27°C to 57°C. Calculate the energy of activation.
Given R = 8.314 J K-1 mol-1, log 4 = 0.6021

1. 380.4 kJ/mol
2. 3.80 kJ/mol
3. 3804 kJ/mol
4. 38.04 kJ/mol

Subtopic:  Arrhenius Equation |
From NCERT
NEET - 2024
Hints

Which of the following expression is correct for the reaction given below?
$$2 \mathrm{HI}_{(g)} \rightarrow \mathrm{H}_{2(g)}+\mathrm{I}_{2(g)}$$

 1 $$\dfrac{-\Delta[\mathrm{H}]]}{\Delta t}=\dfrac{2 \Delta\left[\mathrm{H}_2\right]}{\Delta t}$$ 2 $$\dfrac{-\Delta[\mathrm{HI}]}{\Delta t}=\dfrac{4\Delta\left[\mathrm{I}_2\right]}{\Delta t}$$ 3 $$\dfrac{-\Delta[\mathrm{HI}]}{\Delta t}=\dfrac{4 \Delta\left[\mathrm{H}_2\right]}{\Delta t}$$ 4 $$\dfrac{-\Delta[\mathrm{H}]}{\Delta t}=\dfrac{\Delta\left[\mathrm{H}_2\right]}{\Delta t}$$

Subtopic:  Definition, Rate Constant, Rate Law |
79%
From NCERT
NEET - 2024
Hints

Effective collisions are known to possess:

A: energy greater than threshold energy.
B: breaking of old bond in reactant.
C: formation of new bond in product.
D: high activation energy.
E: proper orientation.

Choose the correct answer from the options given below:
1. A, B, C, D only
2. A, B, C, E only
3. A, C, D, E only
4. B, C, D, E only
Subtopic:  Arrhenius Equation |
63%
From NCERT
NEET - 2024
Hints

The time taken by the first order decomposition of $$\text{SO}_2\text{Cl}_2$$ to decompose to 40% is 560 seconds. The rate constant for the reaction is:
(log 2.5 = 0.3979)

1. $$2.726 \times 10^{-5} \mathrm{~min}^{-1}$$
2. $$2.276 \times 10^{-5} \mathrm{~min}^{-1}$$
3. $$2.216 \times 10^{-5} \mathrm{~min}^{-1}$$
4. $$2.126 \times 10^{-5} \mathrm{~min}^{-1}$$
Subtopic:  First Order Reaction Kinetics |
From NCERT
NEET - 2024
Hints

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 Assertion (A): A reaction can have zero activation energy. Reason (R): The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.
In the light of the above statements choose the correct answer from the options given below:
 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.
Subtopic:  Arrhenius Equation |
From NCERT
NEET - 2023
Hints

For a certain reaction, the rate = $$k[A]^2[B],$$ when the initial concentration of A is tripled keeping the concentration of B constant, the initial rate would be:
1. increase by a factor of three
2. decrease by a factor of nine
3. increase by a factor of six
4. increase by a factor of nine
Subtopic:  Order, Molecularity and Mechanism |
75%
From NCERT
NEET - 2023
Hints

The correct options for the rate law that corresponds to overall first order reaction is:
 1 $$Rate =k[A]^0[B]^2$$ 2 $$Rate =k[A][B]$$ 3 $$Rate=k[A]^{1 / 2}[B]^2$$ 4 $$Rate =k[A]^{-1 / 2}[B]^{3 / 2}$$
Subtopic:  Order, Molecularity and Mechanism |
77%
From NCERT
NEET - 2023
Hints
For a reaction $$3A \rightarrow 2B$$
The average rate of appearance of B is given by $$\Delta [B] \over \Delta t$$.
 1 $$-\Delta [A] \over \Delta t$$ 2 $$-3\Delta [A] \over 2\Delta t$$ 3 $$-2\Delta [A] \over 3\Delta t$$ 4 $$\Delta [A] \over \Delta t$$