Q. No.If a reaction A + B → C is exothermic to the extent of 30 kJ mol−1 and the forward reaction has an activation energy of 249 kJ mol−1, the activation energy for the reverse reaction in kJ mol-1 will be:
| 1. | 324 | 2. | 279 |
| 3. | 40 | 4. | 100 |
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Which of the following statements regarding the rate constant of a reaction is correct?
| 1. | The rate constant approximately doubles with an increase in temperature of 10 °C |
| 2. | The rate constant becomes half with an increase in temperature of 10 °C |
| 3. | The rate constant remains unchanged with a rise in temperature by 10 °C |
| 4. | None of the above |
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The correct statement about X in the below mentioned graph:
| 1. | X represents activation energy without catalyst. |
| 2. | X represents activation energy with catalyst. |
| 3. | X represents the enthalpy of the reaction without a catalyst. |
| 4. | X represents the enthalpy of the reaction with a catalyst. |
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Select the correct option based on statements below:
| Assertion (A): | All collisions of reactant molecules lead to product formation. |
| Reason (R): | Only those collisions in which molecules have the correct orientation and sufficient kinetic energy lead to the compound formation. |
| 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. |
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The nature of the reaction represented in the following graph is:
| 1. | Endothermic reaction |
| 2. | Exothermic reaction |
| 3. | Both endothermic and exothermic reactions are represented by the same graph. |
| 4. | None of the above |
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For a reaction A → B, the Arrhenius equation is given as \(log_{e}k \ = \ 4 \ - \ \frac{1000}{T}\) the activation energy in J/mol for the given reaction will be:
1. 8314
2. 2000
3. 2814
4. 3412
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The rate constant, activation energy and Arrhenius factor of a reaction at 25°C are
3.0 × 10⁻⁴ s⁻¹, 104.4 kJ mol⁻¹, and 6.0 × 10¹⁴ s⁻¹, respectively.
Find the rate constant as the temperature approaches infinity.
1. 2.0 × 1018 s-1
2. 6.0 × 1014 s-1
3.
4. 3.6 × 1030 s-1
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For A + B C + D, H = -20 kJ mol-1 , the activation energy of the forward reaction is 85 kJ mol-1. The activation energy for the backward reaction is…. kJ mol-1.
| 1. | 105 | 2. | 85 |
| 3. | 40 | 4. | 65 |
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If of a reaction is 100 kJ mol-1, then the activation energy for the forward reaction must be :
1. Greater than 100 kJ mol-1
2. Less than 100 kJ mol-1
3. Equal to 100 kJ mol-1
4. None of the above.
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