Q. No.Select the correct option based on statements below:
| Assertion (A): | For elementary reactions, the law of mass action and the rate of law expression are generally the same. |
| Reason (R): | The molecularity of an elementary reaction is always one. |
| 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. |
Subtopic: Order, Molecularity and Mechanism |
67%
Level 2: 60%+
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Select the correct option based on statements below:
| Assertion (A): | Base catalyzed hydrolysis of ethyl acetate is a first-order reversible reaction. |
| Reason (R): | The order of reaction always depends on the stoichiometry of the reaction. |
| 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. |
Subtopic: Order, Molecularity and Mechanism |
55%
Level 3: 35%-60%
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Select the correct option based on statements below:
| Assertion (A): | The overall order of reaction is the sum of the power of all the reactants in the rate expression. |
| Reason (R): | There are many higher-order reactions. |
| 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. |
Subtopic: Order, Molecularity and Mechanism |
Level 3: 35%-60%
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The correct statements among the following regarding any unimolecular reaction are-
| (a) | Only one reacting species is involved in the rate-determining step |
| (b) | The order and the molecularity of the slowest step are equal to one |
| (c) | The molecularity of the reaction is one and the order is zero |
| (d) | Both molecularity and order of the reaction are one |
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
Subtopic: Order, Molecularity and Mechanism |
55%
Level 3: 35%-60%
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The correct statements among the following regarding a complex reaction are-
| (a) | Order of the overall reaction is the same as the molecularity of the slowest step. |
| (b) | Order of the overall reaction is less than the molecularity of the slowest step. |
| (c) | Order of the overall reaction is greater than the molecularity of the slowest step. |
| (d) | The molecularity of the slowest step is never zero or non-integer. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Subtopic: Order, Molecularity and Mechanism |
75%
Level 2: 60%+
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The graphs that represent a zero-order reaction are:
| (a) |  |
(b) |  |
| (c) |  |
(d) |  |
| 1. | (a, b) | 2. | (b, c) |
| 3. | (c, d) | 4. | (a, d) |
Subtopic: Order, Molecularity and Mechanism |
Level 3: 35%-60%
Hints
Match the graph given in Column I with the order of reaction given in Column II.
More than one item in Column I may be linked to the same item in Column II:
| Column I | Column II | ||
| (i) |  |
(a) | 1st order |
| (ii) |  |
(b) | Zero order |
| (iii) |  |
||
| (iv) |  |
||
| (i) | (ii) | (iii) | (iv) | |
| 1. | (a) | (b) | (a) | (b) |
| 2. | (a) | (b) | (b) | (a) |
| 3. | (a) | (a) | (b) | (b) |
| 4. | (b) | (b) | (a) | (a) |
Subtopic: Order, Molecularity and Mechanism |
76%
Level 2: 60%+
Hints
Links
Match the items of Column I with items of Column II
| Column I (Concepts Related to Chemical Kinetics) |
Column II (Related Terms) |
||
| A. | Mathematical expression for the rate of reaction | I. | Rate constant |
| B. | Rate of reaction for zero-order reaction is equal to | II. | Rate law |
| C. | Units of rate constant for zero-order reaction is same as that of | III. | Order of slowest step |
| D. | Order of a complex reaction is determined by | IV. | Rate of reaction |
Codes:
| A | B | C | D | |
| 1. | III | IV | I | II |
| 2. | I | II | III | IV |
| 3. | II | I | IV | III |
| 4. | IV | I | III | II |
Subtopic: Order, Molecularity and Mechanism |
86%
Level 1: 80%+
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Select the correct option based on statements below:
| Assertion (A): | The order of the reaction can be zero or fractional. |
| Reason (R): | We cannot determine order from the balanced chemical equation. |
| 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. |
Subtopic: Order, Molecularity and Mechanism |
61%
Level 2: 60%+
Hints
Links
Select the correct option based on statements below:
| Assertion (A): | Order and molecularity are the same. |
| Reason (R): | Order is determined experimentally, and molecularity is the sum of the stoichiometric coefficient of the rate-determining the elementary step. |
| 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: Order, Molecularity and Mechanism |
79%
Level 2: 60%+
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Links
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