Q. No.Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I (Order of reaction) | List-II (Unit of rate constant) | ||
| A. | Zero order | I. | \(\mathrm{mol}^{-1} \mathrm{~L} \mathrm{~s}^{-1}\) |
| B. | First order | II. | \(\mathrm{mol}^{-2} \mathrm{~L}^2 \mathrm{~s}^{-1}\) |
| C. | Second order | III. | \(\mathrm {s}^{-1}\) |
| D. | Third order | IV. | \(\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) |
Choose the correct answer from the options given below:
| 1. | A-IV, B-III, C-II, D-I |
| 2. | A-I, B-II, C-III, D-IV |
| 3. | A-IV, B-III, C-I, D-II |
| 4. | A-IV, B-II, C-I, D-III |
Subtopic: Definition, Rate Constant, Rate Law | First Order Reaction Kinetics |
74%
Level 2: 60%+
NEET - 2026
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Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature, T(K).
\(\ln k = 14\cdot34 - \frac{1\cdot25 \times 10^4}{T}\)
The energy of activation in kcal mol-1 for the reaction is :
(Given : k in \(s^{-1}, R = 1.987 ~\text{cal mol}^{-1} K^{-1})\)
1. 12.42
2. 14.34
3. 18.63
4. 24.84
\(\ln k = 14\cdot34 - \frac{1\cdot25 \times 10^4}{T}\)
The energy of activation in kcal mol-1 for the reaction is :
(Given : k in \(s^{-1}, R = 1.987 ~\text{cal mol}^{-1} K^{-1})\)
1. 12.42
2. 14.34
3. 18.63
4. 24.84
Subtopic: First Order Reaction Kinetics | Arrhenius Equation |
63%
Level 2: 60%+
NEET - 2026
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If the rate constant of a reaction is \(0.03 s^{-1}\), how much time does it take for \(7.2\text { mol L}^{-1}\) concentration of the reactant to get reduced to \(0.9~\text {mol L} ^{-1}?\)
(Given: log 2=0.301)
1. 210 s
2. 21.0 s
3. 69.3 s
4. 23.1 s
(Given: log 2=0.301)
1. 210 s
2. 21.0 s
3. 69.3 s
4. 23.1 s
Subtopic: First Order Reaction Kinetics |
65%
Level 2: 60%+
NEET - 2025
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If the half-life \((t_{1/2})\) for a first order reaction is \(1~\text{minute}\), then the time required for \(99.9 \%\) completion of the reaction is closest to :
1. \(5~\text{minutes}\)
2. \(10~\text{minutes}\)
3. \(2~\text{minutes}\)
4. \(4~\text{minutes}\)
1. \(5~\text{minutes}\)
2. \(10~\text{minutes}\)
3. \(2~\text{minutes}\)
4. \(4~\text{minutes}\)
Subtopic: First Order Reaction Kinetics |
67%
Level 2: 60%+
NEET - 2025
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What is the rate constant for a reaction if the time taken by the first-order decomposition of \(\text{SO}_2\text{Cl}_2\) to decompose to 40% is 560 seconds?
[Given: log 2.5 = 0.3979]
[Given: 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. | None of the above |
Subtopic: First Order Reaction Kinetics |
Level 3: 35%-60%
NEET - 2024
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For a first-order reaction A \(\rightarrow\) Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min-1 is
| 1. | 0.2303 | 2. | 1.3818 |
| 3. | 0.9212 | 4. | 0.4606 |
Subtopic: First Order Reaction Kinetics |
72%
Level 2: 60%+
NEET - 2022
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The half-life of a first-order reaction is 2000 years. If the concentration after 8000 years is 0.02 M, then the initial concentration was:
1. 0.16 M
2. 0.32 M
3. 0.08 M
4. 0.04 M
1. 0.16 M
2. 0.32 M
3. 0.08 M
4. 0.04 M
Subtopic: First Order Reaction Kinetics |
62%
Level 2: 60%+
NEET - 2022
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Which of the following is the time required to reduce the amount of a reactant from 2.0 g to 0.2 g for a first-order reaction with rate constant \(k = 4.606 \times 10^{-3} \, \text{s}^{-1}\)?
| 1. | 200 s | 2. | 500 s |
| 3. | 1000 s | 4. | 100 s |
Subtopic: First Order Reaction Kinetics |
83%
Level 1: 80%+
NEET - 2020
Hints
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
1. t = 2.303/k
2. t = 0.693/k
3. t = 6.909/k
4. t = 4.606/k
Subtopic: First Order Reaction Kinetics |
62%
Level 2: 60%+
NEET - 2019
Hints
A first-order reaction has a rate constant of 2.303 × 10¯3 s¯1. The time required for 40 g of this reactant to reduce to 10 g will be
[Given that ]
| 1. | 230.3 s | 2. | 301 s |
| 3. | 2000 s | 4. | 602 s |
Subtopic: First Order Reaction Kinetics |
84%
Level 1: 80%+
NEET - 2019
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