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Q. No.A first-order reaction has a specific reaction rate of
10–2 sec–1. How much time will it take for 20 g of the reactant to reduce to 5 g?
1.
138.6 sec
2.
346.5 sec
3.
693.0 sec
4.
238.6 sec
10–2 sec–1. How much time will it take for 20 g of the reactant to reduce to 5 g?
Subtopic: First Order Reaction Kinetics |
81%
Level 1: 80%+
NEET - 2017
Hints
The incorrect statement among the following is:
| 1. | The value of the equilibrium constant is changed in the presence of a catalyst. |
| 2. | Enzymes catalyze mainly bio-chemical reactions. |
| 3. | Coenzymes increase the catalytic activity of the enzyme. |
| 4. | The catalyst does not initiate any reaction. |
Subtopic: Catalyst |
77%
Level 2: 60%+
NEET - 2017
Hints
The correct statement among the following is:
| 1. | the rate of a first-order reaction does not depend on reactant concentration; the rate of a second-order reaction does depend on reactant concentrations. |
| 2. | the half-life of a first-order reaction does not depend on [A]o; the half-life of a second-order reaction does depend on [A]0 |
| 3. | a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed. |
| 4. | the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations |
Subtopic: Definition, Rate Constant, Rate Law |
78%
Level 2: 60%+
NEET - 2018
Hints
When the initial concentration of the reactant is doubled, the half-life period of a zero-order reaction is:
| 1. | Halved | 2. | Doubled |
| 3. | Tripled | 4. | Unchanged |
Subtopic: Order, Molecularity and Mechanism |
78%
Level 2: 60%+
NEET - 2018
Hints
Which quantity is altered when a catalyst is introduced during a chemical reaction?
| 1. | Internal energy | 2. | Enthalpy |
| 3. | Activation energy | 4. | Entropy |
Subtopic: Definition, Rate Constant, Rate Law |
94%
Level 1: 80%+
NEET - 2016
Hints
The rate of a first-order reaction is 0.04 mol L–1 s–1 at 10 seconds and 0.03 mol L–1 s–1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s
Subtopic: First Order Reaction Kinetics |
62%
Level 2: 60%+
NEET - 2016
Hints
The rate Constant of reaction A → B is 0.6 × 10–3 \(\mathrm{molL}^{-1} \mathrm{~S}^{-1}\). If the Concentration of A is 5M, then the concentration of B after 20 min is:
1. 1.08M
2. 3.60M
3. 0.36M
4. 0.72M
Subtopic: Order, Molecularity and Mechanism |
57%
Level 3: 35%-60%
NEET - 2015
Hints
The activation energy of a reaction can be determined from the slope of which of the following graphs?
| 1. | In K vs T |
| 2. | In \(\frac K T\) vs T |
| 3. | In K vs \(\frac 1 T\) |
| 4. | In \(\frac T K\) vs \(\frac 1 T\) |
Subtopic: Arrhenius Equation |
92%
Level 1: 80%+
NEET - 2015
Hints
When the initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction will be:
1. 0
2. 1
3. 1.5
4. 2
Subtopic: Order, Molecularity and Mechanism |
85%
Level 1: 80%+
NEET - 2015
Hints
Links
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20oC to 35oC? (R = 8.314 J mol–1 K–1)
| 1. | 269 kJ mol–1 | 2. | 34.7 kJ mol–1 |
| 3. | 15.1 kJ mol–1 | 4. | 342 kJ mol–1 |
Subtopic: Arrhenius Equation |
68%
Level 2: 60%+
AIPMT - 2013
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