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Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A reaction can have zero activation energy. |
| Reason (R): | The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy. |
| 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: Arrhenius Equation |
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For a certain reaction, the rate = \(k[A]^2[B],\) when the initial concentration of A is tripled keeping the concentration of B constant, the initial rate would be:
1. increase by a factor of three
2. decrease by a factor of nine
3. increase by a factor of six
4. increase by a factor of nine
1. increase by a factor of three
2. decrease by a factor of nine
3. increase by a factor of six
4. increase by a factor of nine
Subtopic: Order, Molecularity and Mechanism |
72%
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NEET - 2023
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The correct options for the rate law that corresponds to overall first order reaction is
| 1. | \( Rate =k[A]^0[B]^2 \) | 2. | \( Rate =k[A][B] \) |
| 3. | \(Rate=k[A]^{1 / 2}[B]^2 \) | 4. | \(Rate =k[A]^{-1 / 2}[B]^{3 / 2}\) |
Subtopic: Order, Molecularity and Mechanism |
78%
From NCERT
NEET - 2023
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For a reaction \(3A \rightarrow 2B\)
The average rate of appearance of B is given by \(\Delta [B] \over \Delta t\). The correct relation between the average rate of appearance of B with the average rate of disappearance of A is given in option:
The average rate of appearance of B is given by \(\Delta [B] \over \Delta t\). The correct relation between the average rate of appearance of B with the average rate of disappearance of A is given in option:
| 1. | \(-\Delta [A] \over \Delta t\) | 2. | \(-3\Delta [A] \over 2\Delta t\) |
| 3. | \(-2\Delta [A] \over 3\Delta t\) | 4. | \(\Delta [A] \over \Delta t\) |
Subtopic: Definition, Rate Constant, Rate Law |
76%
From NCERT
NEET - 2023
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The given graph is a representation of the kinetics of a reaction.
The y and x axes for zero and first-order reactions, respectively are
The y and x axes for zero and first-order reactions, respectively are
| 1. | zero order (y=rate and x=concentration), first order (y=rate and x=t1/2) |
| 2. | zero order (y=concentration and x=time), first order (y=t1/2 and x = concentration) |
| 3. | zero order (y=concentration and x= time), first order (y=rate constant and x= concentration) |
| 4. | zero order (y=rate and x=concentration), first order (y=t1/2 and x = concentration) |
Subtopic: Order, Molecularity and Mechanism |
59%
From NCERT
NEET - 2022
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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 |
69%
From NCERT
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For the reaction, 2A → B, rates= k[A]2. If the concentration of reactant is doubled, then the:
| (a) | rate of reaction will be doubled. |
| (b) | rate constant will remain unchanged, however rate of reaction is directly proportional to the rate constant. |
| (c) | rate constant will change since the rate of reaction and rate constant are directly proportional to each other. |
| (d) | rate of reaction will increase by four times. |
Identify the set of correct statements & choose the correct answer from the options given below:
| 1. | (a) and (c) only | 2. | (a) and (b) only |
| 3. | (b) and (d) only | 4. | (c) and (d) only |
Subtopic: Definition, Rate Constant, Rate Law |
68%
From NCERT
NEET - 2022
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The plot of ln k vs \({1 \over T}\) for the following reaction
\(2N_2O_5(g) \rightarrow 4NO_2 (g) + O_2(g) \) gives a straight line with the slope of the line equal to \(-1.0 \times 10^4 K \). The activation energy for the reaction in J mol-1 is:
(Given R = 8.3 J K-1 mol-1)
1. \(4.0 \times 10^2 \)
2. \(4.0 \times 10^{-2} \)
3. \(8.3 \times 10^{-4} \)
4. \(8.3 \times 10^4 \)
Subtopic: Arrhenius Equation |
74%
From NCERT
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 |
Subtopic: First Order Reaction Kinetics |
61%
From NCERT
NEET - 2022
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For a chemical reaction, 4A + 3B → 6C + 9D
rate of formation of C is 6 × 10–2 mol L–1 s–1 and rate of disappearance of A is 4 × 10–2 mol L–1 s–1. The rate of reaction and amount of B consumed in interval of 10 seconds, respectively will be:
1. 1 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1
2. 10 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1
3. 1 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1
4. 10 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1
rate of formation of C is 6 × 10–2 mol L–1 s–1 and rate of disappearance of A is 4 × 10–2 mol L–1 s–1. The rate of reaction and amount of B consumed in interval of 10 seconds, respectively will be:
1. 1 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1
2. 10 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1
3. 1 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1
4. 10 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1
Subtopic: Definition, Rate Constant, Rate Law |
67%
From NCERT
NEET - 2022
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