- 1(current)
Q. No.The role of a catalyst is to change:
| 1. | Gibbs energy of the reaction |
| 2. | Enthalpy of reaction |
| 3. | The activation energy of the reaction |
| 4. | Equilibrium constant |
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Column I
(Thermodynamic/Kinetic Principle)
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Column II
(Impact on Reaction Dynamics)
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| A. | Catalyst alters the rate of reaction | 1. | Proper orientation is not always there |
| B. | 2. | By lowering the activation energy | |
| C. | Energetically favorable reactions are sometimes slow | 3. | Total probability is one |
| D. | The area under the Maxwell-Boltzmann curve is constant | 4. | Refers to the fraction of molecules with energy equal to or greater than the activation energy |
Codes:
| A | B | C | D | |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 3 | 1 | 4 | 2 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 3 | 4 | 1 | 2 |
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The factor(s) that affect the rate of a chemical reaction is/are:
| 1. | Concentration/Pressure of reactants. |
| 2. | Temperature. |
| 3. | Presence of a catalyst. |
| 4. | All of the above. |
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An incorrect statement regarding a catalyst is:
| 1. | It catalyzes the forward and backward reactions to the same extent. |
| 2. | It alters the Gibbs free energy of the reaction. |
| 3. | It is a substance that does not change the equilibrium constant of a reaction. |
| 4. | It provides an alternate mechanism by reducing activation energy between reactants and products. |
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Select the correct option based on statements below:
| Assertion (A): | The enthalpy of reaction remains constant in the presence of a catalyst. |
| Reason (R): | A catalyst participating in the reaction forms a different activated complex and lowers down the activation energy but the difference in energy of the reactant and the product remains the same. |
| 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. | Both (A) and (R) are False. |
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In the presence of a catalyst, the heat evolved or absorbed during the reaction:
| 1. | Increases. | 2. | Decreases. |
| 3. | Remains unchanged. | 4. | May increase or decrease. |
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- 1(current)
Q. No.
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