The first order rate constant for a certain reaction increases from\(1.667 \times 10^{-6} \mathrm{~s}^{-1} \text { at } 727^{\circ} \mathrm{C} \text { to } 1.667 \times 10^{-4} \mathrm{~s}^{-1} \text { at } 1571{ }^{\circ} \mathrm{C}.\) The rate constant at \(1150^{\circ} \mathrm{C}\) is: 
(assume activation energy is constant over the given temperature range)

1. \(3.911 \times 10^{-5} \mathrm{~s}^{-1} \) 2. \(1 .139 \times 10^{-5} \mathrm{~s}^{-1} \)
3. \(3.318 \times 10^{-5} s^{-1} \) 4. \(1.193 \times 10^{-5} \mathrm{~s}^{-1}\)

Subtopic:  Arrhenius Equation |
 51%
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The solvolysis of 2-chloro-2-methyl propane in aqueous acetone: H2O+CH33C-ClHO-CCH33+H+Cl- has a rate equation. 

Rate =K[(CH3 )3 C  Cl].From this it may be inferred that the energy profile of the reaction leading from reactants to products is

(A)                                 

(B) 

(C)                             

(D) 

Subtopic:  First Order Reaction Kinetics |
 51%
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The thermal decomposition of a compound is of first order. If 50 % of a sample of the compound decomposes in 120 minutes, how long will it take for 90 % of the compound to decompose?

1. 399 min                                                        

2. 410 min

3. 250 min                                                        

4. 120 min

Subtopic:  First Order Reaction Kinetics |
 65%
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The half-life for radioactive decay of 14C is 5730 y. An archaeological artifact containing wood had only 80 % of the 14C found in a living tree. The age of the sample will be:

1. 1657.3 y                                                

2. 1845.4 y

3. 1512.4 y                                                

4. 1413.1 y

Subtopic:  First Order Reaction Kinetics |
 69%
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Two substances A and B are present such that [A0] = 4[B0] and half life of A is 5 minute and that of B
is 15 minute. If they start decaying at the same time following first order kinetics how much time later will the concentration of both of them would be same.

(1) 15 minute                                        

(2) 10 minute

(3) 5 minute                                          

(4) 12 minute

Subtopic:  First Order Reaction Kinetics |
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The following data were obtained during the first-order thermal decomposition of SO2Cl2 at a constant volume.

SO2Cl2(g) → SO2(g) + Cl2(g)

Experiment Time/s Total pressure/atm
1 0 0.5
2 100 0.6

The rate of the reaction when total pressure is 0.65 atm will be:

1. 7.8 × 10-4 s-1 atm.                                  

2. 0.8 × 10-4 s-1 atm.

3. 2.4 × 10-2 s-1 atm.                                   

4. 6.1 × 10-8 s-1 atm.

Subtopic:  First Order Reaction Kinetics |
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Assertion : A lump of coal burns at a moderate rate in air while coal dust burns explosively.

Reason : Coal dust contains very fine particles of carbon.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Definition, Rate Constant, Rate Law |
 74%
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Assertion : Liquid bromine reacts slowly as compared to bromine vapour.

Reason : In liquid bromine, the bromine molecules are held together by a force which is much weaker than the force existing between the two molecules of bromine in the vapour phase.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Definition, Rate Constant, Rate Law |
 56%
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Assertion : The reaction,

N2 (10atm) 3H2 (10atm) 2NH3 (g) is faster.

Reason : Catalyst lowers the activation energy of the reaction.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Arrhenius Equation |
 53%
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Assertion : Molecularity of a reaction cannot be determined experimentally.

Reason : Molecularity is assigned to the reactions on the basis of mechanism.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Order, Molecularity and Mechanism |
 57%
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