# 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 |
51%
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 $$\dfrac{-\Delta[\mathrm{H}I]}{\Delta t}=\dfrac{2 \Delta\left[\mathrm{H}_2\right]}{\Delta t}$$ 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 |
84%
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 |
70%
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

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

Subtopic:  Arrhenius Equation |
64%
From NCERT
NEET - 2024
Hints

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 |
68%
From NCERT
NEET - 2024
Hints

The correct rate law for the given balanced reaction is :
$$4A\,+\,2B$$ → $$C \,+\,3D$$

1. Rate = k[A]4[B]2
2. Rate = k[A]2[B]
3. Rate = k[C][D]3/[A]4[B]2
4. Cannot be determined from the information given.
Subtopic:  Definition, Rate Constant, Rate Law |
From NCERT
Hints

For a reaction $$3A \rightarrow 2B$$
The average rate of appearance of B is given by $$\Delta [B] \over \Delta t$$.
The correct relation between the average rate of appearance of B with the average rate of disappearance of A is:
 1 $$-\Delta [A] \over \Delta t$$ 2 $$-3\Delta [A] \over 2\Delta t$$ 3 $$-2\Delta [A] \over 3\Delta t$$ 4 $$\Delta [A] \over \Delta t$$
Subtopic:  Definition, Rate Constant, Rate Law |
78%
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
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: