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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 |

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H_{2} 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 |

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The elementary step of the reaction, $\mathrm{}$\(2 \mathrm{Na}+\mathrm{Cl}_2\rightarrow2 \mathrm{NaCl}\) is found to follow 3^{rd} order kinetics. Its molecularity is:

1. 1

2. 2

3. 3

4. 4

Subtopic: Order, Molecularity and Mechanism |

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From NCERT

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The rate constants of a reaction at 500K is 0.02s^{–1} . The values of E_{a} is 18.230 kJ. The value of A is-

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 |

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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 |

78%

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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 litre^{2} mole^{-2} min^{-1} |

2. | Rate = K [A]^{3} and litre^{2} mole^{-2} min^{-1} |

3. | Rate = K [A] [B]^{2} and litre mole^{-1} min^{-1} |

4. | Rate = K [A] [B]^{2} and litre^{2} mole^{-2} min^{-1} |

Subtopic: Order, Molecularity and Mechanism |

70%

From NCERT

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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. | t_{1/2} 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 |

54%

From NCERT

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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 |

83%

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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 |

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From NCERT

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Which of the following curves represents a first-order reaction?

1.

2.

3.

4.

1.

2.

3.

4.

Subtopic: First Order Reaction Kinetics |

85%

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