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Q. No.The elementary step of the reaction, \(2 \mathrm{Na}+\mathrm{Cl}_2\rightarrow2 \mathrm{NaCl}\) is found to follow 3rd order kinetics. Its molecularity is:
1.
One
2.
Two
3.
Three
4.
Four
Subtopic: Order, Molecularity and Mechanism |
81%
Level 1: 80%+
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What is the pre-exponential factor for a reaction at 500 K with a rate constant of 0.02 s⁻¹ and an activation energy of 18.230 kJ?
1. 1.61
2. 1.41
3. 1.81
4. 1.21
1. 1.61
2. 1.41
3. 1.81
4. 1.21
Subtopic: Arrhenius Equation |
Level 3: 35%-60%
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For a reaction, A + B → Product; the rate law is given by, r=k[A]1/2[B]2. The order of the reaction is:
| 1. | –1.5 | 2. | 1.5 |
| 3. | 0.5 | 4. | 2.5 |
Subtopic: Order, Molecularity and Mechanism |
79%
Level 2: 60%+
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H2 gas is absorbed on the metal surface like gold, tungsten, etc. This follows ________ order reaction:
| 1. | Third | 2. | Second |
| 3. | Zero | 4. | First |
Subtopic: Order, Molecularity and Mechanism |
69%
Level 2: 60%+
JEE
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Half-life of substance A following first order kinetics is 5 days. Starting with 100g of A, the amount left after 15 days will be:
| 1. | 25 g | 2. | 50 g |
| 3. | 12.5 g | 4. | 6.25 g |
Subtopic: First Order Reaction Kinetics |
85%
Level 1: 80%+
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For the reaction, A + B → Products
The rate law and unit of rate constant respectively, are:
| Experiment | [A] | [B] | Rate (mole litre-1 min-1) |
| 1. | 0.01 | 0.01 | 2 × 10-4 |
| 2. | 0.02 | 0.01 | 4 × 10-4 |
| 3. | 0.01 | 0.02 | 8 × 10-4 |
| 1. | Rate = K [A]2 [B] and litre2 mole-2 min-1 |
| 2. | Rate = K [A]3 and litre2 mole-2 min-1 |
| 3. | Rate = K [A] [B]2 and litre mole-1 min-1 |
| 4. | Rate = K [A] [B]2 and litre2 mole-2 min-1 |
Subtopic: Order, Molecularity and Mechanism |
71%
Level 2: 60%+
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Example(s) of a pseudo-unimolecular reaction among the following is/are:
| 1. | \(\small{CH_3COOC_2H_5 + NaOH \rightarrow CH_3COONa + C_2H_5OH}\) |
| 2. | \(\small{CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH}\) |
| 3. | \(C_{12}H_{22}O_{11}+ H_2O \xrightarrow{H^+} C_6H_{12}O_6+ C_6H_{12}O_6\\ (cane~ sugar)~~~~~~~~~~~~~~~~(glucose)~~~~~(Fructose)\) |
| 4. | Both 2 and 3 |
Subtopic: Order, Molecularity and Mechanism |
85%
Level 1: 80%+
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The rate equation for the reaction 2A+B→C is found to be:
rate = k [A] [B]
The correct statement in relation to this reaction is that the:
| 1. | Unit of k must be s-1 |
| 2. | t1/2 is a constant. |
| 3. | Rate of formation of C is twice the rate of disappearance of A. |
| 4. | Value of k is independent of the initial concentrations of A and B. |
Subtopic: Definition, Rate Constant, Rate Law |
55%
Level 3: 35%-60%
JEE
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Which of the following statements is not true for the rate constant, k?
| 1. | large value of k indicates fast reactions. |
| 2. | The value of k is independent of the concentration of reactants |
| 3. | The value of k is independent of the concentration of products |
| 4. | The value of the rate constant, k, as the name suggests is always constant for a particular reaction at all temperatures. |
Subtopic: Arrhenius Equation |
72%
Level 2: 60%+
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Subtopic: First Order Reaction Kinetics |
86%
Level 1: 80%+
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