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Q. No.| Assertion (A): | A reaction can have zero activation energy. |
| Reason (R): | The minimum amount of energy required by reactant molecules so that their energy becomes equal to threshold value, is called activation energy. |
| 1. | (A) is False but (R) is True. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
The plot of ln k vs \({1 \over T}\) for the following reaction, \(2N_2O_5(g) \rightarrow 4NO_2 (g) + O_2(g) \) gives a straight line with the slope of the line equal to \(-1.0 \times 10^4 K \).
What is the activation energy for the reaction in J mol–1 ?
(Given: R = 8.3 J K–1 mol–1)
| 1. | \(4.0 \times 10^2 \) | 2. | \(4.0 \times 10^{-2} \) |
| 3. | \(8.3 \times 10^{-4} \) | 4. | \(8.3 \times 10^4 \) |
For a reaction AB, enthalpy of reaction is and enthalpy of activation is . The correct potential energy profile for the reaction is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The slope of Arrhenius Plot (ln k v/s ) of the first-order reaction is . The value of Ea of the reaction is:
[Given R = 8.314 JK–1 mol–1]
| 1. | 166 kJ mol–1 | 2. | –83 kJ mol–1 |
| 3. | 41.5 kJ mol–1 | 4. | 83.0 kJ mol–1 |
Find the quantity that increases when the concentration of reactants in a reaction is increased.
| 1. | Heat of reaction | 2. | Threshold energy |
| 3. | Collision frequency | 4. | Activation energy |
What does ZAB represent in the collision theory of chemical reactions?
| 1. | The fraction of molecules with energies greater than Ea |
| 2. | The collision frequency of reactants, A and B |
| 3. | Steric factor |
| 4. | The fraction of molecules with energies equal to Ea |
For a reaction, the activation energy is zero, and the rate constant at 200 K is 1.6 × 10⁶ s⁻¹.
Find the rate constant at 400 K.
Given: R = 8.314 J K⁻¹ mol⁻¹.
| 1. | 3.2 × 104 s-1 | 2. | 1.6 × 106s-1 |
| 3. | 1.6 × 103 s-1 | 4. | 3.2 × 106 s-1 |
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